Launched in 2002 this open-access e-journal presents peer-reviewed papers in the field of sedimentology, stratigraphy, and paleontology. http://paleopolis.rediris.es/cg/ 2011-10-10T18:07:13Z 2011-10-10T18:07:13Z 2011-10-10T18:07:13Z 2011-10-10T18:07:13Z http://paleopolis.rediris.es/cg/CG2011_L06/ carnetsdegeologie@hotmail.com

Eric Buffetaut, Bernard Gibout, Isabelle Launois & Claude Delacroix.- The sauropod dinosaur Cetiosaurus Owen in the Bathonian (Middle Jurassic) of the Ardennes (NE France): insular, but not dwarf.- A chevron bone from an Early Bathonian oolitic limestone in the Ardennes (NE France) is referred to the sauropod dinosaur Cetiosaurus Owen, previously known from the Middle Jurassic of England, on the basis of its rod-like distal end. This is the first well attested occurrence of Cetiosaurus in France. The presence of Cetiosaurus remains in the Bathonian of both Oxfordshire and the Ardennes is explainable by the fact that these regions were situated on the margin of the London-Brabant Massif land area, on which sauropod populations apparently lived. Contrary to the condition in other sauropods in insular environments, there is no evidence of dwarfism in Cetiosaurus from the London-Brabant Massif, probably because this emergent area was connected to the much larger Fenno-Scandian Shield.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_L06.- Handle-ID: http://hdl.handle.net/2042/43897

2011-10-10T18:02:45Z 2011-10-10T18:02:45Z 2011-10-10T18:02:45Z http://paleopolis.rediris.es/cg/CG2011_L05/ carnetsdegeologie@hotmail.com

Olev Vinn & Elena K. Kupriyanova.- Evolution of a dense outer protective tube layer in serpulids (Polychaeta, Annelida).- Although the walls of most serpulid tubes are homogeneous, tubes of certain species may contain up to four ultrastructurally distinct layers. Some of these layers are made of densely packed large crystals and others are composed of sparsely packed fine crystals. In almost all (16 of 17) examined species having layered tubes, the dense layer is located in the outer wall part and the layer(s) composed of fine and relatively sparsely packed crystals are positioned in the inner wall part. Two species have transparent tube walls made entirely of densely packed crystals. Fossil serpulid tubes with dense outer layers (DOL) are known from the Late Cretaceous (Pentaditrupa subtorquata) and the Eocene (Pyrgopolon cf. mellevillei and Rotularia spirulaea). DOL gives a characteristic smooth shiny appearance to the tube surface and presumably evolved as an adaptation against drilling predation by gastropods and to delay shell dissolution in the waters of the deep-sea under-saturated with calcium carbonate.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_L05.- Handle-ID: http://hdl.handle.net/2042/43896

2011-10-10T18:15:37Z 2011-10-10T18:15:37Z 2011-10-10T18:15:37Z http://paleopolis.rediris.es/cg/CG2011_L04/ carnetsdegeologie@hotmail.com

Robert Busnardo & Bruno R.C. Granier.- Aptian ammonites of Abu Dhabi (United Arab Emirates).- The identification of some twenty ammonite fragments from oil wells drilled in offshore Abu Dhabi revealed the presence of six Aptian genera: Cheloniceras, Epicheloniceras, Gargasiceras, Colombiceras, Pseudohaploceras, and Macroscaphites. These ammonites indicate the Furcata Zone and the succeeding Martini Zone. The Gargasian age of the upper part (HST) of the Shu'aiba as well as that of the whole of the Bab are thus firmly established.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_L04.- Handle-ID: http://hdl.handle.net/2042/43895

2011-10-10T18:21:01Z 2011-10-10T18:21:01Z 2011-10-10T18:21:01Z http://paleopolis.rediris.es/cg/CG2011_L03/ carnetsdegeologie@hotmail.com

Robert Étienne & Jean-Pierre Larue.- Source and evolution of the clinopyroxenes in the Loire and Seine basins (France) based on grain morphology and color.- Variation in the characteristics (color, morphology) of clinopyroxene grains (CPX) in alluvial deposits and other surficial formations in the Loire valley, the Gâtinais and the Beauce show that many are pristine and come directly from recent volcanic eruptions, whereas weathered grains, clearly reworked, come from erosion of Cenozoic and Pleistocene volcanic rocks of the French Massif Central. After deposition, the CPX have been increasingly altered by longer exposures. Weathering of brown CPX yields paler minerals which are greenish-brown, colourless or two-coloured. Similarly, the CPX found in the Seine basin are from recent volcanic ash or old Sologne deposits, and not from Loire alluvial deposits, so that a Pleistocene palaeo-Loire-Seine river is improbable.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_L03.- Handle-ID: http://hdl.handle.net/2042/43894

2011-10-10T18:24:51Z 2011-10-10T18:24:51Z 2011-10-10T18:24:51Z http://paleopolis.rediris.es/cg/CG2011_B03/ carnetsdegeologie@hotmail.com

Loïc Costeur & Martin Schneider.- Catalogue of the Eocene mammal types of the Natural History Museum Basel.- This catalogue presents a list of the Eocene mammalian type specimens held in the collection of the Natural History Museum Basel (Naturhistorisches Museum Basel, hereafter NMB). After a close inspection of the very rich Eocene collection (several tens of thousands of specimens), a total of 51 valid holotypes (plus 16 invalid species) were identified together with 21 valid lectotypes and several hundreds paratypes, paralectotypes and syntypes. These types belong to 123 originally described species, of which 99 are still valid, 30 having been moved to another genus.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_B03.- Handle-ID: http://hdl.handle.net/2042/43898

2011-07-20T19:04:01Z 2011-07-20T19:04:01Z 2011-07-20T19:04:01Z http://paleopolis.rediris.es/cg/CG2011_SP01/ carnetsdegeologie@hotmail.com

Patrick Génot & Bruno R.C. Granier.- Cenozoic Dasycladales. A photo-atlas of Thanetian, Ypresian and Bartonian species from the Paris basin.- Cenozoic Dasycladales of the French sedimentary basins are noteworthy for the exceptional quality of their preservation. Although most fossil Dasycladales are known only in thin sections often difficult to interpret, the coatings of the Dasycladales in these basins, particularly in the Paris basin, are easy to extract from sandy sediments and then are examined under the electron microscope. This method of investigation facilitates greatly the identification of the external and internal features of each species.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_SP01.- Handle-ID: http://hdl.handle.net/2042/43105

2011-07-05T18:35:07Z 2011-07-05T18:35:07Z 2011-07-05T18:35:07Z http://paleopolis.rediris.es/cg/CG2011_L02/ carnetsdegeologie@hotmail.com

Adeline Kerner, Régine Vignes Lebbe & Françoise Debrenne.- Computer-aided identification of the Archaeocyatha genera now available online.- The Archaeocyatha are a key group in several of the many discrete disciplines that together make feasible a valid history of the Earth: they are the oldest of the calcified sponges, the first metazoans to build reefs (in association with calcimicrobes), are characteristic fossils used for the biozonation of the first, pre-trilobitic Cambrian stage (Tommotian)… To date, a valid key to their identification has not been available, so a tool for that purpose has been devised: it was created using the software XPER2, and is now available free, online. Published in English, the knowledge base includes the 307 valid described genera identified by 120 descriptors (85 morphological and ontogenetic, 8 stratigraphic and geographic and 27 taxonomic). A key to identification is supplemented by detailed descriptive cards with images of type specimens of each genus and details of their morphology that aid identification.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_L02.- Handle-ID: http://hdl.handle.net/2042/42329

2011-07-05T18:46:37Z 2011-07-05T18:46:37Z 2011-07-05T18:46:37Z http://paleopolis.rediris.es/cg/CG2011_A04/ carnetsdegeologie@hotmail.com

Fateh Mebrouk, Jean-Paul Colin & Fatima Hennache.- Un gisement d'ostracodes non-marins dans l'Éocène inférieur du Djebel Amour, Atlas saharien central, Algérie : taxonomie, paléoécologie et paléobiogéographie.- Un gisement bien daté par une riche microflore de charophytes caractéristique de la zone à Peckichara disermas, de l'Éocène inférieur (Yprésien inférieur = Sparnacien = Ilerdien) a livré une intéressante association d'ostracodes non-marins dans le Djebel Amour, Atlas Saharien occidental, en Algérie. Cette faune est caractérisée par la dominance du genre Neocyprideis avec l'espèce nouvelle Neocyprideis meguerchiensis nov. sp. et la présence occasionnelle des genres Hemicyprideis, Perissocytheridea (P. algeriensis nov. sp.) et Limnocythere. Il s'agit de la seconde découverte du genre Neocyprideis dans le Paléogène du continent africain, la première étant dans l'Éocène inférieur du Sénégal. Les Neocyprideis sont représentés à 75 % par des formes lisses, normalement calcifiées, à 20 % par des individus réticulés et tuberculés et à 5 % par des spécimens uniquement réticulés. Ce polymorphisme suggère une saisonnalité marquée avec une salinité variable. La dominance des morphes lisses bien calcifiés indique un milieu avec un équilibre entre le Ca++ et le Mg++, les morphes réticulés caractérisant un milieu plus riche en Mg++. La présence de forme tuberculées-réticulées suggère des apports saisonniers organo-siliceux continentaux et une salinité pouvant temporairement atteindre des valeurs inférieures ou égales à 5 psu.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_A04.- Handle-ID: http://hdl.handle.net/2042/42328

2011-07-05T18:50:23Z 2011-07-05T18:50:23Z 2011-07-05T18:50:23Z http://paleopolis.rediris.es/cg/CG2011_A03/ carnetsdegeologie@hotmail.com

Chahira Zaîbi, Fekri Kamoun, Pierre Carbonel & Mabrouk Montacer.- Distribution des ostracodes dans les sédiments de subsurface de la Sebkha El-Guettiate (Skhira, golfe de Gabès). Intérêt pour la reconstitution des paléo-environnements de l'Holocène.- L'étude quantitative et qualitative des ostracodes des carottes SG1 et BSC2, prélevées au niveau de la Sebkha El-Guettiate de Skhira (Sud - Est Tunisien), nous a permis de reconnaître les trois associations suivantes : (1) association de milieu marin s.l. composée de Aurila prasina Barbieto-Gonzalez, 1971, Cushmanidea elongata (Brady, 1868), Urocythereis oblonga (Brady, 1866), U. favosa (Roemer, 1838) (marin côtier), Basselerites berchoni (Brady, 1869), Semicytherura incongruens (G.W. Müller, 1894), S. paradoxa (G.W. Müller, 1894), S. sella (Sars, 1866), S. ruggierii (Pucci, 1955), Carinocythereis carinata (Roemer, 1838) et Paracytheridea depressa (G.W. Müller, 1894) (marin ouvert) ; (2) association de milieu lagunaire, à salinité variable, constituée, de Xestoleberis aurantia (Baird, 1838), Leptocythere fabaeformis (G.W. Müller, 1894) et Cytherois fischeri (Sars, 1866), (3) association de milieu saumâtre estuarien où se développent Cyprideis torosa (Jones, 1850) et Loxoconcha elliptica Brady, 1868. Ces associations révèlent les caractéristiques des paléo-environnements qui se sont succédés, au cours de l'Holocène supérieur, à l'emplacement de la Sebkha El-Guettiate. Trois phases peuvent être reconnues : i) la première phase à caractère lagunaire estuarien dominant (6595 ± 120 à 6055 ± 30 ans B.P.) comprend un environnement lagunaire ouvert riche en ostracodes marins dominants évoluant brutalement vers un environnement lagunaire estuarien. Ce dernier est caractérisé par un évènement de haute énergie, vers 6595 ± 120 ans B.P., révélé par des apports détritiques riches en galets, synchrones à l'enrichissement des ostracodes saumâtres. Ensuite, une lagune s'installe vers 6055 ± 30 ans B.P. permettant le développement des ostracodes principalement saumâtres dominants mais aussi lagunaires. ii) la phase suivante (6055 ± 120 à 5150 ± 50 ans B.P.) se distingue par la réapparition des taxons marins associés aux espèces lagunaires et saumâtres traduisant une lagune estuarienne largement ouverte soumise à l'influence des courants de dérive littorale. Ces courants, en édifiant des cordons littoraux, ont entraîné la fermeture du milieu et la fin de la dominance des ostracodes saumâtres. iii) la dernière phase (5150 ± 50 ans B.P. à l'actuel) comprend un milieu caractérisé par la richesse des taxons lagunaires évoluant vers un milieu laguno-saumâtre recevant le dépôt de washover suite à un événement climatique extrême. La lagune, de plus en plus fermée, évoluera progressivement vers la sebkha actuelle.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_A03.- Handle-ID: http://hdl.handle.net/2042/42327

2011-07-05T18:54:40Z 2011-07-05T18:54:40Z 2011-07-05T18:54:40Z http://paleopolis.rediris.es/cg/CG2011_M01/ carnetsdegeologie@hotmail.com

Philippe Quereilhac & Yvon Guinot.- Les "Marnes à theoi" de Pamproux (Deux-Sèvres, France), Sous-zone à Antecedens (Oxfordien moyen, Zone à Plicatilis) : diversité des faunes et découverte de nouvelles espèces d'ammonites.- Deux coupes effectuées à Doux et Pamproux, dans le département des Deux-Sèvres (Poitou, France), ont mis à jour la base de l'Oxfordien moyen (Zone à Plicatilis). Seule la coupe de Pamproux (située sur le site de l'usine Pampr'oeuf), dont la Zone à Plicatilis n'est représentée que par la Sous-zone à Antecedens, est étudiée dans le détail. Les collectes ont été effectuées in situ et dans les déblais constitués uniquement de marnes attribuées à la Sous-zone à Antecedens. Le lavage des sédiments a permis de collecter un très grand nombre de fossiles très diversifiés et de tailles extrêmement réduites. C'est ainsi que furent découverts un grand nombre d'individus appartenant à deux nouvelles espèces de Taramelliceratinae, ainsi que deux nouvelles espèces de Glochiceras, de taille adulte bien différentes, ressemblant à s'y méprendre à Ochetoceras (Ochetoceras) canaliculatum (von Buch, 1831) morphe subclausum [m] Oppel, 1863. La sous-famille des Taramelliceratinae est la faune ammonitique dominante.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_M01.- Handle-ID: http://hdl.handle.net/2042/42331

2011-04-27T19:12:53Z 2011-04-27T19:12:53Z 2011-04-27T19:12:53Z http://paleopolis.rediris.es/cg/CG2011_A02/ carnetsdegeologie@hotmail.com

Abdelmajid Choukri, Oum-Keltoum Hakam & Jean-Louis Reyss.- Difficultés de datation des niveaux marins pléistocènes à l'aide de coquilles de mollusques fossiles : cas du niveau ouljien sur la côte du Haut Atlas au Maroc.- Afin de comprendre la difficulté de datation des niveaux marins à l'aide des échantillons de coquilles de mollusques et d'essayer d'établir des outils méthodologiques pouvant aider à juger de la validité d'un âge 230Th /234U, nous confrontons 80 analyses radiochimiques d'échantillons de coquilles de mollusques prélevés dans des plages marines fossiles situées entre 4 et 8 m par rapport au niveau de l'eau actuel. les niveaux où ont été faits les prélèvements, analogues à ceux de la côte égyptienne de la Mer Rouge, sont sensés appartenir au stade climatique 5e daté à 122 ka environ. On note que les âges obtenus sont souvent rajeunis indépendamment du site, du taux de calcite, de la teneur en uranium et du rapport 234U/238U. Contrairement aux échantillons de coraux, le critère minéralogique ne peut pas être utilisé pour choisir les échantillons non recristallisés, certaines coquilles de mollusques actuelles sont en aragonite, d'autres sont en calcite et d'autres contiennent les deux formes sans que les rapports de proportion en soient encore bien connus. Devant cette situation, nous avons multiplié les analyses sur des échantillons de coquilles de mollusques appartenant à plusieurs espèces prélevés aux mêmes endroits afin de comprendre le scénario de rajeunissement des âges et d'essayer d'établir éventuellement des critères méthodologiques pouvant nous renseigner sur la validité de l'âge calculé. Des scénarios sur le mode d'incorporation de l'uranium et son rôle dans le rajeunissement de l'âge ont été également imaginés et discutés.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_A02.- Handle-ID: http://hdl.handle.net/2042/39245

2011-04-27T19:16:46Z 2011-04-27T19:16:46Z 2011-04-27T19:16:46Z http://paleopolis.rediris.es/cg/CG2010_A01R/ carnetsdegeologie@hotmail.com

Jean Vermeulen.- Discussion of: Problems in the identity of ''Crioceras'' barremense Kilian, 1895 (Ancyloceratida, Late Barremian), and their proposed resolution, by D. Bert et alii (CG2010_A01) [Alternative title: The nomenclatural status and the acceptation of the genus Barrancyloceras Vermeulen, 2000, and of its type species].- This work is a reply to the paper of Bert et alii (2010) who contested the validity of the genus Barrancyloceras and its type species. The answers and precisions brought up herein deal with: the nomenclatural status of Barrancyloceras barremense (Kilian, 1895); the nomenclatural status of the genus Barrancyloceras Vermeulen, 2000; the understanding of the species Barrancyloceras barremense (Kilian, 1895); the value, as a subzone index species of subzone, of Barrancyloceras barremense and B. alpinum.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A01R.- Handle-ID: http://hdl.handle.net/2042/38798

2011-03-15T19:22:52Z 2011-03-15T19:22:52Z 2011-03-15T19:22:52Z http://paleopolis.rediris.es/cg/CG2011_L01/ carnetsdegeologie@hotmail.com

Olev Vinn.- The role of an internal organic tube lining in the biomineralization of serpulid tubes.- Most known serpulid tube ultrastructures in contact with an organic inner tube lining do not show the direction in which they developed. But spherulitic prismatic structures found in the innermost part of the tube wall of Recent Crucigera websteri, C. zygophora, Floriprotis sabiuraensis, and Pyrgopolon ctenactis indicate that the structure grew toward the organic inner tube lining and also toward the tube‘s lumen. Similar directions of growth for this structure are seen in Hydroides sp. from the Miocene of Austria. Growth towards the tube's lumen is opposite to what one would expect if the organic inner tube lining is being used as a scaffold for the biomineralization of CaCO3.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_L01.- Handle-ID: http://hdl.handle.net/2042/38798

2011-01-17T14:14:25Z 2011-01-17T14:14:25Z 2011-01-17T14:14:25Z http://paleopolis.rediris.es/cg/CG2011_A01/ carnetsdegeologie@hotmail.com

Didier Bert, Gérard Delanoy & Stéphane Bersac.- The Dichotomus Horizon: proposal for a new biochronologic unit of the Giraudi Zone of the Upper Barremian of southeastern France, and considerations regarding the genus Imerites Rouchadzé (Ammonoidea, Gassendiceratinae).- Recent revisions of the genus Imerites Rouchadzé make it possible to introduce a new biochronologic horizon to define more precisely the lower boundary of the Giraudi Zone: the Dichotomus Horizon. Using the concept of 'interval zone', this new horizon maintains the current lower boundary of the Giraudi Zone as accepted by authors, and thus contributes to the stabilization of the Barremian zonal system. This stabilization is also strengthened by abandonment of the use of "Crioceras" cristatus d'Orbigny (nomen dubium) that ought not be used as an index species in detriment of Imerites giraudi (Kilian). The classification, origin, and intraspecific variation of the genus Imerites Rouchadzé are examined.- SRef-ID: http://overview.sref.org/1634-0744/CG2011_A01.- Handle-ID: http://hdl.handle.net/2042/36091

2010-12-31T14:27:08Z 2010-12-31T14:27:08Z 2010-12-31T14:27:08Z http://paleopolis.rediris.es/cg/CG2010_A09/ carnetsdegeologie@hotmail.com

Rémy Gourvennec, José Manuel Piçarra, Yves Plusquellec, Zélia Pereira, José Tomás Oliveira & Michel Robardet.- Lower Devonian faunas and palynomorphs from the Dornes Syncline (Central Iberian Zone, Portugal): stratigraphical and paleogeographical implications.- In the Dornes syncline, southern Central Iberian Zone, Portugal, the uppermost levels of the Serra do Luação Formation up to now have been considered to be of Pridoli-Lochkovian? age because they lie immediately under the Dornes Formation, which is of Pragian age and is well defined stratigraphically. New paleontological elements including benthic faunas and palynomorphs allow us to confirm that the top of the Serra do Luação Formation is securely Lochkovian, for upper Lochkovian strata are present although relatively thin. The transition from the Serra do Luação to the Dornes formations and their lithostratigraphical relationship are now clear: the terrigenous succession belongs to the Serra do Luação Formation and the limestones represent the Dornes Formation. The benthic faunas clearly have North-Gondwanan affinities.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A09.- Handle-ID: http://hdl.handle.net/2042/35627

2010-12-24T14:30:11Z 2010-12-24T14:30:11Z 2010-12-24T14:30:11Z http://paleopolis.rediris.es/cg/CG2010_A08/ carnetsdegeologie@hotmail.com

László Bujtor.- Systematics, phylogeny and homeomorphy of the Engonoceratidae Hyatt, 1900 (Ammonoidea, Cretaceous) and revision of Engonoceras duboisi Latil, 1989.- The Engonoceratidae may well have originated on the shallow marine carbonate platforms of the southern margin of the Mediterranean Province of the Tethyan Realm during the earliest Albian (?latest Aptian). In the entire Tethyan Realm and beyond adaptive radiation of the group was rapid and successful during the early Albian as indicated by endemic centres in the Peruvian Basin and the Western Interior Sea (USA). Later the group successfully enlarged its distribution, and invaded some provinces (Mowry Sea, Canada) of the Boreal Realm. The mode of life of engonoceratids seems to have been nektoplanktonic, epipelagic, and stenohaline, restricted to shallow water and platform or in some cases extremely shallow (littoral and lagoonal) facies which may have helped their radiation. The group is distinctive and consists of nine genera and up to a hundred species, although its origin is still obscure. Their appearance may have been triggered by the oceanic anoxic event (OAE 1b) and their rapid rise may have been helped by their shallow water mode of life and the global mid-Cretaceous warming and rise in sea level. The fall of the engonoceratids coincides with the end-Cenomanian rapid transgression, which may have changed their shallow water habitats. Today the group is considered to have been a successful colonizer, a reliable stratigraphical indicator for shallow marine environments and a pioneer taxon for recognition of transgressive phases. Based on new material and sutural analysis, Engonoceras duboisi is revised and assigned to Parengonoceras. A set of features consisting of a simplified ceratitid suture, lanceolate and compressed oxycone shell together comprising a shallow marine ecotype is pointed out as a successful and repeated morphotype among Mesozoic Ammonoidea, for it was repeated three times during ammonoid evolution.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A08.- Handle-ID: http://hdl.handle.net/2042/35626

2010-12-14T14:18:46Z 2010-12-14T14:18:46Z 2010-12-14T14:18:46Z http://paleopolis.rediris.es/cg/CG2010_L04/ carnetsdegeologie@hotmail.com

Olev Vinn & Mark A. Wilson.- Early large borings from a hardground of Floian-Dapingian age (Early and Middle Ordovician) in northeastern Estonia (Baltica).- Large plug- or slightly amphora-shaped borings have been found in the hardground marking the boundary between Early and Middle Ordovician rocks in northeastern Estonia. These borings cut large bioclasts of the trilobite Megistaspis and cannot be assigned with certainty to any known ichnotaxon. They indicate that the diversity of early large borings may have been greater than was recognized previously.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_L04.- Handle-ID: http://hdl.handle.net/2042/35594

2010-11-30T14:21:20Z 2010-11-30T14:21:20Z 2010-11-30T14:21:20Z http://paleopolis.rediris.es/cg/CG2010_L03/ carnetsdegeologie@hotmail.com

Christian C. Emig.- Fossil Phoronida and their inferred ichnotaxa.- Various ichnotaxa found in hard substrates are interpreted as "phoronid" trace fossils. Their records are briefly reviewed. An interpretation of Diorygma found in the shells of brachiopods is not compatible with phoronid morphology and anatomy. Criteria for the discrimination of phoronid burrows and borings from those of similar organisms from others are difficult to establish even when the evidence and conclusions made therefrom are sound.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_L03.- Handle-ID: http://hdl.handle.net/2042/35531

2010-11-22T14:32:44Z 2010-11-22T14:32:44Z 2010-11-22T14:32:44Z http://paleopolis.rediris.es/cg/CG2010_A07/ carnetsdegeologie@hotmail.com

Rémi Jardat.- L'évolution des peuplements d'ammonites au cours de l'Oxfordien inférieur (Zone à Mariae et Zone à Cordatum) du Jura (Est de la France).- L'étude de plus de 40 coupes entaillant les "marnes à Creniceras renggeri" du Jura français (Oxfordien inférieur) a permis : un découpage biochronostratigraphique fin, soit 16 peuplements successifs, stables à l'échelle de tout le secteur géographique étudié ; la corrélation de ces peuplements avec la zonation adoptée par le Groupe Français d'Étude du Jurassique ainsi qu'avec les séries du sud de l'Angleterre (Weymouth) et de la Pologne (région de Cracovie) ; une approche autécologique et synécologique des faunes du Jura ; leur interprétation en termes de paléoprofondeur et de stratigraphie séquentielle. Les principaux résultats obtenus sont : l'individualisation de la Sous-zone à Costicardia ; la validation de la subdivision de la Zone à Mariae proposée par Fortwengler et Marchand (1994), mettant notamment en évidence un horizon à woodhamense surmontant un horizon à scarburgense ; la subdivision de l'horizon à woodhamense en deux unités : l'une à woodhamense s. s. surmontée d'une autre unité où abonde la var. woodhamense normandiana (Spath) ; la mise en évidence d'une corrélation entre des unités tectoniques de part et d'autre de l'accident de Salins et certaines caractéristiques des peuplements d'ammonites ; l'identification de cinq épisodes d'évolution régionale de la paléoprofondeur pour l'ensemble du Jura qui pourraient être interprétées comme des unités séquentielles : un épisode d'approfondissement entre l'horizon à scarburgense et l'horizon à praemartini inclus, une stabilisation du niveau marin pendant l'horizon à alphacordatum, une légère tendance régressive au cours de l'horizon à praecordatum, une nouvelle stabililisation depuis la Sous-zone à Bukowskii jusqu'à la Sous-zone à Costicardia, et une nouvelle inversion de tendance au cours de la Sous-zone à Cordatum.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A07.- Handle-ID: http://hdl.handle.net/2042/35492

2010-08-27T14:36:47Z 2010-08-27T14:36:47Z 2010-08-27T14:36:47Z http://paleopolis.rediris.es/cg/CG2010_A06/ carnetsdegeologie@hotmail.com

Bernard Clavel, Robert Busnardo, Jean Charollais, Marc André Conrad & Bruno Granier.- Répartition biostratigraphique des orbitolinidés dans la biozonation à ammonites (plate-forme urgonienne du Sud-Est de la France). Partie 1 : Hauterivien supérieur - Barrémien basal.- Une répartition biostratigraphique des orbitolinidés calée sur la biozonation à ammonites a été établie pour l'Hauterivien supérieur et le Barrémien inférieur pro parte du SE e la France. Elle est basée sur l'étude de huit coupes de terrain relevées dans le SE de la France, qui ont livré des orbitolinidés, encadrés ou surmontés par des faciès à ammonites associées parfois à des échinides et des dasycladales significatifs sur le plan biostratigraphique. Il est établi à cette occasion que trois espèces d'orbitolinidés caractérisent l'Hauterivien supérieur : il s'agit de Praedictyorbitolina busnardoi, Paleodictyoconus beckerae et Valserina primitiva.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A06.- Handle-ID: http://hdl.handle.net/2042/33369

2010-08-27T14:40:09Z 2010-08-27T14:40:09Z 2010-08-27T14:40:09Z http://paleopolis.rediris.es/cg/CG2010_A05/ carnetsdegeologie@hotmail.com

Morteza Taherpour Khalil Abad, Marc André Conrad, Ali Asghar Aryaei & Ali Reza Ashouri.- Barremian-Aptian Dasycladalean algae, new and revisited, from the Tirgan Formation in the Kopet Dagh, NE Iran.- Abundant, diversified algal assemblages comprising more than 25 species of Dasycladales are described from Barremian-Aptian limestone deposits of the Tirgan Formation in NE Iran. New species are described: one of them possibly belongs to a new endosporate genus, tentatively assigned the Triploporellaceae; two others, Clypeina ? sp. 1 and Rajkaella ? sp. 1, are left in open nomenclature. The widely distributed, locally abundant Montiella ? elitzae is revisited, because of the presence of a complete, exceptionally well preserved specimen. Yet to be demonstrated, the species is a junior synonym of Turkmenaria adducta Maslov, also originally described from the Kopet Dagh. Other species found in the Arkan section have already been reported from remote locations, primarily in Europe, in areas corresponding to the Northern and/or Southern Tethyan domains. Some of them are known only from the Hauterivian and/or the Barremian, excluding the Aptian, thus dating the lower part of the Arkan section as Barremian, but not excluding the Late Hauterivian.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A05.- Handle-ID: http://hdl.handle.net/2042/33368

2010-08-27T14:43:02Z 2010-08-27T14:43:02Z 2010-08-27T14:43:02Z http://paleopolis.rediris.es/cg/CG2010_A04/ carnetsdegeologie@hotmail.com

Francis Robaszynski & Moncef Mzoughi.- The Abiod at Ellès (Tunisia): stratigraphies, Campanian-Maastrichtian boundary, correlation.- In central Tunisia near the village of Ellès is Wadi Ed Dam. There the Abiod Formation, underlain by the Kef marls and capped by the El Haria marls, crops out in an almost uninterrupted exposure about 286 m thick. In view of its possible use as a regional litho- and bio- stratigraphic reference section for the southern border of the Tunisian trough it is examined in detail here. Fossils studied include foraminifera (115 samples representing 6 micropaleontologic zones, see chart) and ammonites. The biohorizons established are based on the first (FO) or last occurrence (LO) of certain species of planktonic foraminifers in addition to the FO of already established foraminiferal zonal markers. Ammonite markers found include both the FO and LO of some forms, or just one or the other. The location of the Campanian-Maastrichtian (Cp-Ma) boundary time line at Ellès is established by comparison with that determined at Kalaat-Senan and with that of the international stratotype of Tercis (France), ratified by the International Union of Geological Sciences. At Kalaat-Senan the Cp-Ma boundary is set at the lower third of the upper indurated limestone bar of the Abiod Formation - the Ncham Member. Its location at Kalaat-Senan is based on the upper limit of occurrence of Nostoceras (Nostoceras) hyatti and Pseudokossmaticeras brandti together with the FO of Nostoceras magdadiae, a Maastrichtian ammonite. At Ellès several of these same markers are present, along with the respective planktonic foraminiferal zones. The length in years of some lithologic units and paleontologic zones in the Upper Cretaceous succession of wadi Ed Dam was calculated using cyclostratigraphy. The Abiod Formation represents 13.2 Ma, the Radotruncana calcarata Zone 0.79 Ma, and the Nostoceras (Bostrychoceras) polyplocum Zone 0.97 Ma. A proposed subdivision of the Upper Campanian is recommended at the base of the Bostrychoceras Zone. LI et alii's 1999 proposal for fixing the location of the Cp-Ma boundary at the top of a limestone bed in the El Haria marls is reviewed.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A04.- Handle-ID: http://hdl.handle.net/2042/33367

2010-07-01T17:53:32Z 2010-07-01T17:53:32Z 2010-07-01T17:53:32Z http://paleopolis.rediris.es/cg/CG2010_B02/ carnetsdegeologie@hotmail.com

Jean-Pierre Bellier, Robert Mathieu & Bruno Granier.- Short Treatise on Foraminiferology (Essential on modern and fossil Foraminifera).- After some forty years in the academic world and before abandoning a position as an employee of the State educational system to enter the new world of "pensioners", it seemed worthwhile to the first author (J.-P.B.) of this brief discussion to compile a short document that presents a synopsis of the knowledge acquired, taught and put to use for more than four decades. This fascicle reviews only the foraminifers, which, along with calcareous nannofossils, are the fundamental tools of modern biostratigraphy, used for worldwide oceanographic studies and for the correlation of oil wells. It deals essentially with the small foraminifers, that is those of modest size without a complex internal architecture. These include the planktonic foraminifers of which the rapid evolution and great dispersion permit the establishment of reliable biochronologic scales of reference. <br /> This short course is intended for students preparing for the CAPES (Certificat d'aptitude au professorat de l'enseignement du second degré = Certificate of Aptitude for a Professorship of Instruction in the Second Grade), for students working toward the Aggregation in Natural Sciences in pursuit of a scientific career in the universities or in the CNRS (Centre National de la Recherche Scientifique = National Centre for Scientific Research), and for students who hope to work in the oil industry where a specialization in the field of micropaleontology is considered useful and is still valued. It will also interest amateur naturalists and that portion of the general public attracted by the beauties of the microscopic world, now living, or extinct and represented only by fossils.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_B02.- Handle-ID: http://hdl.handle.net/2042/33629

2010-07-01T18:01:18Z 2010-07-01T18:01:18Z 2010-07-01T18:01:18Z http://paleopolis.rediris.es/cg/CG2010_SP01/ carnetsdegeologie@hotmail.com

Bernard Mamet & Alain Préat.- Un atlas d'algues calcaires. Carbonifère, Alaska arctique.- Atlas illustrant 54 genres d'Algues marines associées à quelques microproblématiques. Ceux-ci sont observés dans les coupes de terrain et les puits de forage du Groupe de Lisburne dans toute l'étendue des Cordillères arctiques de l'Alaska (Brooks Range).- SRef-ID: http://overview.sref.org/1634-0744/CG2010_SP01.- Handle-ID: http://hdl.handle.net/2042/33628

2010-05-31T17:30:00Z 2010-05-31T17:30:00Z 2010-05-31T17:30:00Z http://paleopolis.rediris.es/cg/CG2010_A03/ carnetsdegeologie@hotmail.com

Bruno R.C. Granier.- Bucurella, a new genus of the Thyrsoporelleae (fossil Dasycladalean algae).- A new genus, Bucurella, is described and figured; it is based on Macroporella espichelensis Deloffre et Ramalho, 1971, a taxon known only from the Late Jurassic. It is characterized by the presence of distinctive whorls, each with three thick and broad (fertile) ramifications. The lateral division formula is 1 F: 3 F: (3x2) F: (3x2x2) F = (1: 3: 6: 12); that is the primary ramification divides into three secondaries which in turn branch dichotomously into tertiaries and again into quaternaries. It and its descendant, Zergabriella, are assigned to the Tribe Thyrsoporelleae.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A03.- Handle-ID: http://hdl.handle.net/2042/32425

2010-05-31T17:33:45Z 2010-05-31T17:33:45Z 2010-05-31T17:33:45Z http://paleopolis.rediris.es/cg/CG2010_L02/ carnetsdegeologie@hotmail.com

Michel Bilotte, Yves Laurent & Dominique Téodori.- Restes d'hadrosaure dans le Crétacé terminal marin de Larcan (Petites Pyrénées, Haute-Garonne, France).- La découverte de deux fragments d'hadrosaure (maxillaire et carré) dans des sédiments marins de la fin du Crétacé (Maastrichtien terminal) est relatée. Si ce type de taphocoenose n'est pas exceptionnel pour des organismes continentaux, sa situation à environ 1 m sous la zone à iridium de la limite K/T méritait d'être soulignée. Cette présentation permet en outre de faire le point sur des données bio et chronostratigraphiques récemment formulées dans cette région.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_L02.- Handle-ID: http://hdl.handle.net/2042/32428

2010-05-31T17:27:50Z 2010-05-31T17:27:50Z 2010-05-31T17:27:50Z http://paleopolis.rediris.es/cg/CG2010_A02/ carnetsdegeologie@hotmail.com

Gilles S. Odin.- Traces de volcanisme explosif dans le Campanien pyrénéen aux alentours du stratotype de limite Campanien-Maastrichtien à Tercis (SO France, N Espagne). Repérage biostratigraphique avec une étude particulière du foraminifère Radotruncana calcarata.- Les traces d'un événement volcanique explosif ont été recherchées dans des affleurements campaniens de faciès plate-forme et de faciès flysch dans le domaine ouest-pyrénéen : Sud-Ouest de la France et Nord de l'Espagne. Le repérage stratigraphique de cet événement a nécessité une étude micropaléontologique préalable qui a été productive dans cinq sections principales illustrées ici : Tercis, Peyrata, Rébénacq, Lasseube, Zumaya ainsi que dans trois autres affleurements situés près d'Orthez, de Pau, et en Navarre espagnole. La dissociation acétolytique des carbonates indurés du faciès de plate-forme (Tercis, Peyrata, Navarre espagnole) a permis de compléter les connaissances antérieures acquises notamment sur les niveaux de marnes du stratotype de la limite Campanien-Maastrichtien de Tercis. Dans ce dernier site, des spécimens dégagés de marqueurs biostratigraphiques ont été obtenus pour la première fois. La rareté du foraminifère Radotruncana calcarata n'est pas propre à l'espèce mais à la rareté générale des tests de foraminifères planctoniques dans le faciès de plate-forme du Bassin Aturien. La variété des microproblematica est confirmée avec l'illustration de 2 nouvelles formes, l'une informellement nommée "microsphère ananas" et l'autre Velafer ovatus nov. gen., nov. sp. ; à Tercis, près de 70 espèces sont actuellement distinguées dont 1 seule était décrite avant nos travaux. Ces microproblematica permettent un repérage temporel relatif aussi précis que celui dérivé des foraminifères planctoniques. Les traces majeures d'un épisode volcanique éruptif connues à Tercis sont situées dans la zone d'existence de Rd. calcarata, immédiatement au-dessus de la disparition de Tubellus hunzikeri, de l'apparition de Lucernellus aubouini et de celle de Aquilegiella varia, trois microproblematica de distribution restreinte dans la série de Tercis. Les mêmes observations ont été faites dans la section voisine de Peyrata. Les sections du faciès flysch ont livré sans difficulté le foraminifère Rd. calcarata mais les microproblematica sont absents. La durée d'existence du marqueur Rd. calcarata est évaluée à 0,80 ± 0,05 Ma. <br /> Toutes les sections atteignant la limite Campanien-Maastrichtien ont livré des Contusotruncana (foraminifère) dont les caractéristiques sont celles des spécimens rapprochés de ou attribués à C. contusa à Tercis ; ce taxon, différent, de la forme-type, est illustré de nouveau afin de permettre des comparaisons en milieu océanique. Ces nouvelles études renforcent le bien-fondé du choix de la Grande Carrière à Tercis comme stratotype de limite en précisant la chronologie des événements campaniens et son potentiel de corrélation régional et mondial grâce à la diversité de son enregistrement biologique qui témoigne de l'ampleur de la biodiversité au Crétacé supérieur. <br /> La caractérisation de l'épisode volcanique a été complétée à Tercis par la découverte de sphérules siliceuses légèrement calco-sodiques, avec des traces de magnésium, aluminium et potassium. Dans le stratotype et les sections voisines, l'activité volcanique a été décelée, en outre, par la présence de kaolinite dans la fraction argileuse et de cristaux de minéraux pyroclastiques : sanidine, biotite, zircon, apatite. Dans les niveaux contemporains du bassin du flysch, l'épisode volcanique est plus difficilement caractérisé par la présence de paillettes de biotite de faciès pyroclastique et de cristaux de zircon automorphes ainsi que, plus rarement, d'apatite automorphe. L'interprétation de ces observations nouvelles pose problème : soit les Pyrénées ont été le siège d'une activité volcanique explosive semblable à celle provoquée par un phénomène de subduction, soit les éléments pyroclastiques ont été apportés par voie aérienne d'une distance de plusieurs milliers de km.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A02.- Handle-ID: http://hdl.handle.net/2042/32424

2010-04-04T17:24:18Z 2010-04-04T17:24:18Z 2010-04-04T17:24:18Z http://paleopolis.rediris.es/cg/CG2010_A01/ carnetsdegeologie@hotmail.com

Didier Bert, Robert Busnardo, Gérard Delanoy & Stéphane Bersac.- Problems in the identity of "Crioceras" barremense Kilian, 1895 (Ancyloceratida, Late Barremian), and their proposed resolution.- The study of "Crioceras" barremense Kilian was undertaken as a part of the revision of the Hemihoplitidae. This species was considered "classic" and has been used as the index of an Upper Barremian subzone; this usage raises a number of problems. The type specimen from Tyrol was a fragment described and illustrated by Uhlig as Crioceras sp. ind. aff. roemeri. This specimen could not be retrieved, and a topotype could not be collected. Our study revealed that there is both a biostratigraphic hiatus and important differences between conceptions of this species: (1) that ascribed Uhlig's type specimen (Upper Barremian, Tyrol), (2) Kilian's concept of the specimen he found and named "Crioceras" barremense (probably a Camereiceras from the uppermost levels of the Vandenheckei Subzone or from the basal Sartousiana subzone of the Nauvin site, southeastern France) and (3) current interpretations of authors, who often synonymize the type specimen with Gassendiceras alpinum (d'Orbigny), which occurs in the middle of the Vandenheckei Subzone. So there is a real confusion concerning the synonymy of "Crioceras" barremense. The age of Uhlig's type specimen is too imprecise and its preservation too fragmentary to be reliably identifiable, because the same morphology and ornamentation exist in several species of other genera. Therefore, we recommend the use of the species "Crioceras" barremense Kilian be avoided, in particular as an index, along with that of the genus Barrancyloceras Vermeulen for which "C." barremense is used as reference. Some species formerly assigned to this genus have been referred to the genus Gassendiceras Bert et alii. Consequently, we also recommend the Barremense auctorum Subzone be renamed the Alpinum Subzone (new) [index-species: Gassendiceras alpinum (d'Orbigny)], without changing its limits as currently defined. The lower limit of this subzone is indicated by the first occurrence of Gassendiceras alpinum (a new biohorizon, introduced here), a common, easily identifiable species with a well-defined stratigraphic range.- SRef-ID: http://overview.sref.org/1634-0744/CG2010_A01.- Handle-ID: http://hdl.handle.net/2042/30461

2010-02-15T17:36:32Z 2010-02-15T17:36:32Z 2010-02-15T17:36:32Z http://paleopolis.rediris.es/cg/CG2010_L01/ carnetsdegeologie@hotmail.com

Eric Buffetaut, Bernard Gibout & Danielle Drouin.- A pterosaur from the Toarcian (Early Jurassic) of the Ardennes (northeastern France).- A pterosaur tibia-fibula is described from Toarcian shales ("Marne de Flize") near the city of Charleville-Mézières (Ardennes, northeastern France). The morphology of this element, especially the reduced fibula partially fused to the tibia, suggests that it belongs to the rhamphorhynchid Dorygnathus, which is well represented in the Toarcian Posidonienschiefer of Germany and has also been reported from the Toarcian of Nancy (eastern France).- SRef-ID: http://overview.sref.org/1634-0744/CG2010_L01.- Handle-ID: http://hdl.handle.net/2042/32427

2009-12-31T17:39:48Z 2009-12-31T17:39:48Z 2009-12-31T17:39:48Z http://paleopolis.rediris.es/cg/CG2009_A10/ carnetsdegeologie@hotmail.com

Michel Moullade, Guy Tronchetti & Jean-François Babinot.- Le Gargasien de Gargas (Vaucluse, SE de la France) : synthèse des données de terrain et révision de la microfaune de foraminifères et d'ostracodes.- La coupe de Gargas, stratotype historique de l'étage aptien et du sous-étage gargasien, n'est désormais plus du tout accessible à l'observation par suite de l'urbanisation. À partir d'un ensemble d'échantillons prélevés en 1966 par l'un d'entre nous, nous avons pu cependant la ré-interpréter à la lumière des résultats d'ordre taxinomique et biostratigraphique acquis récemment sur la base de l'étude des microfaunes de l'Aptien du secteur de La Tuilière, distant d'environ 5 km.<br /> Cette nouvelle interprétation micropaléontologique montre que la coupe historique apparaît en fait tronquée à sa base, le Gargasien inférieur (non basal) s'y trouvant en contact quasi-direct avec l'Urgonien ; le Bédoulien terminal, marneux, connu plus à l'Ouest (vers le Chêne) ainsi qu'à La Tuilière, manque ici à l'affleurement. En effet, dans nos échantillons de la série stratotypique nous avons pu mettre successivement en évidence (de bas en haut) :<br /> * la partie supérieure de la zone à Praehedbergella luterbacheri et la zone à Globigerinelloides ferreolensis,<br /> * la zone à G. barri,<br /> * le tout début de la zone à G. algerianus,<br /> soit la majeure partie du Gargasien inférieur, le Gargasien moyen et le passage au Gargasien supérieur. <br /> La partie supérieure de la zone à G. barri et le passage à la zone à G. algerianus correspondent à une séquence marquée par l'instauration d'un faciès marno-sableux, dont les termes supérieurs ont historiquement fourni des ammonites de l' "horizon de Clansayes" (sensu ante). Cette donnée ne peut être confortée par les microfaunes, dont la conservation se dégrade rapidement dans les niveaux détritiques, au point même qu'elles vont quasiment jusqu'à disparaître dans les sables et grès sus-jacents au Clansayésien auct. Par analogie avec le secteur de Banon, distant d'une dizaine de kilomètres, ces termes détritiques du sommet de la Colline de Gargas pourraient appartenir à l'Albien supérieur-Vraconnien.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A10.- Handle-ID: http://hdl.handle.net/2042/30051

2009-12-31T17:44:11Z 2009-12-31T17:44:11Z 2009-12-31T17:44:11Z http://paleopolis.rediris.es/cg/CG2009_A09/ carnetsdegeologie@hotmail.com

Dermeval A. Do Carmo, Ricardo P. Meireles, Paulo A.Z. Suarez & Vinicius M. Mello.- Size variations of the vestibula of Krithe gnoma Do Carmo & Sanguinetti, 1999 (Ostracoda): a new procedure for their analysis.- The species Krithe gnoma was described from Holocene sediments on the continental margin of Brazil, where it occurs on both shelf and slope. The shelf distribution of this species is restricted to those areas influenced by the Malvinas current between 32°11' and 22°31'S. K. gnoma was selected due to the excellent resolution of images of the anterior vestibule. So the range in size of the vestibula of this species was used to determine whether or not the dimensions of the anterior vestibule were to some degree related to amount of dissolved oxygen in the water at the sampling site. Female valves of the 7th and 8th instars were measured and their sizes and those of the anterior vestibule were compared. These valves and the reference carapace were collected at six localities in the southern shelf area. The anterior vestibule of right and left valves of the 7th instar and one of the 8th instar from discrete localities were measured. In the reference carapace, the larger left valve also has the larger vestibule. A gerontic 8th instar has valves larger than those of the previous instars, but its vestibula are smaller than those of the 7th instar. The vestibula of the left valves of the 7th instar collected at discrete localities showed consistent differences in size related to the oxygen content of the sampling site. The relationship between vestibule size and oxygen content is inversely proportional. However, the poor correlation factor (R2<<1) of these results are not precise enough to support Peypouquet's hypothesis. But the size of the vestibula of K. gnoma does show some degree of relationship to oxygen content. So it is important to measure the vestibula of species of Krithe using the procedure described here. Rigorous application of this procedure will eliminate the possibility of discrimination based on variations in size due to ontogeny and dimorphism leaving only those related to actual valve size. In any case, variations in the size of vestibula may have a phenotypic origin.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A09.- Handle-ID: http://hdl.handle.net/2042/30050

2009-10-31T17:47:02Z 2009-10-31T17:47:02Z 2009-10-31T17:47:02Z http://paleopolis.rediris.es/cg/CG2009_A08/ carnetsdegeologie@hotmail.com

Christian Emig.- Nummulus brattenburgensis and Crania craniolaris (Brachiopoda, Craniidae).- The Brattingsborg pennies are mentioned in medieval texts dating from the middle of the first millennium and many popular medieval legends refer to their occurrence on Ivö Island in the Scania region (Sweden) as brattingsborgpenningar or in Latin as Nummulus brattenburgensis. Actually they are valves of the fossil brachiopod Crania craniolaris originally described by Linnaeus (1758) as Anomia craniolaris from the Upper Cretaceous. Later Retzius (1781) created the genus Crania based on these specimens from Ivö Island and on another species he described under Crania (now Isocrania) egnabergensis from Ignaberga in the Scania region. The scientific history of those two species is reviewed along with that of Danocrania tuberculata (Nilsson, 1826), formerly figured as Craniolites brattenburgicus, from the Danian of Scania. Two legends about these "pennies" are included.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A08.- Handle-ID: http://hdl.handle.net/2042/29780

2009-10-31T17:49:40Z 2009-10-31T17:49:40Z 2009-10-31T17:49:40Z http://paleopolis.rediris.es/cg/CG2009_M03/ carnetsdegeologie@hotmail.com

Pierre-Olivier Mojon, Hamid Haddoumi & André Charrière.- Nouvelles données sur les Charophytes et Ostracodes du Jurassique moyen-supérieur - Crétacé inférieur de l'Atlas marocain.- Les "Couches rouges" continentales du Jurassique moyen-Crétacé inférieur de l'Atlas marocain ont livré de très intéressants nouveaux taxons de charophytes et d'ostracodes lacustres : Aclistochara africana n.sp. (Bathonien), Feistiella atlantis n.sp. (Hauterivien ? - Barrémien inférieur), Cypridea suprajurassica n.sp., Cypridea mohandi n.sp. et Cypridea demnatensis n.sp. (Oxfordien ? - Kimméridgien), Harbinia atlasica n.sp. (Hauterivien ? - Barrémien inférieur). Les nouvelles données micropaléontologiques obtenues depuis 2002 apportent les résultats suivants : <br /> * Dans le Haut-Atlas central, découverte de charophytes et ostracodes dulçaquicoles du Jurassique supérieur (Dictyoclavator ramalhoi, Porochara kimmeridgensis, Aclistochara bransoni, Cypridea suprajurassica, Cypridea mohandi, Cypridea demnatensis), mise en évidence d'une ingression marine restreinte au Barrémien attestée par des ostracodes de milieu lagunaire saumâtre (Harbinia atlasica) et de présumés ostracodes marins Trachyleberididae (cf. Strigosocythere strigosa, Cythereis ? sp., Protocythere ? sp.) associés à d'importants dépôts évaporitiques gypseux.<br /> * Dans le Haut-Atlas oriental, mise en évidence de charophytes de la limite Jurassique/Crétacé (Porochara maxima du Tithonien terminal-Berriasien).<br /> * Dans le Crétacé inférieur non marin (Hauterivien ? - Barrémien) du Haut-Atlas central, découverte d'assemblages mixtes eurasiatiques e et gondwaniens g de charophytes : Globator (e) et Feistiella (g), et d'ostracodes laguno-lacustres : Fabanella-Cetacella (e), Darwinula-Cypridea-Harbinia (e & g), Salvadoriella-Petrobrasia-Reconcavona-Paracypridea (g).<br /> * Compléments pour la biozonation des charophytes du Crétacé inférieur (intervalle Valanginien supérieur-Barrémien inférieur) avec Globator hemiglobatoroides Mojon n.sp. (Cénozone M7a, N.-E. de l'Espagne) et Globator mutabilis (Cénozone M7b) du N.-E. de l'Espagne et du Maroc (Haut-Atlas central).<br /> * Reconnaissance dans le domaine atlasique du Maroc de plusieurs étapes de dislocation de la Pangée et d'ouverture de l'océan Atlantique notamment au Bathonien, au Kimméridgien et au Barrémien.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_M03.- Handle-ID: http://hdl.handle.net/2042/29781

2009-09-30T19:17:37Z 2009-09-30T19:17:37Z 2009-09-30T19:17:37Z http://paleopolis.rediris.es/cg/CG2009_A07/ carnetsdegeologie@hotmail.com

Bruno R.C. Granier & Christian Staffelbach.- Quick look cathodoluminescence analyses and their impact on the interpretation of carbonate reservoirs. Case study of mid-Jurassic oolitic reservoirs in the Paris Basin.- Cathodoluminescence analyses on samples from Middle Jurassic oolitic limestones allow us to reconstruct the diagenetic history of these oil and gas reservoirs: a succession of events starting with the early, synsedimentary phases of marine cementation and ending with the addition of hydrocarbons to the reservoir. Constraints on the timing of events are derived from their calibration with the chronology of the well-known regional tectonic calendar. Fracturing, due first to the post-Pyrenean extension and then to the Alpine compression, led respectively in Oligocene times to a recharge of the aquifer and a correlative change in cementation, and in Miocene times to the addition of hydrocarbons into the same flow units, this last event blocking diagenesis, at least in the zone above the oil-water contact. Distributions of cements and residual porosity within sedimentary units without stratigraphic significance, called here "pseudo-parasequences", were for the most part inherited from the original depositional facies.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A07.- Handle-ID: http://hdl.handle.net/2042/28795

2009-09-30T19:14:10Z 2009-09-30T19:14:10Z 2009-09-30T19:14:10Z http://paleopolis.rediris.es/cg/CG2009_A06/ carnetsdegeologie@hotmail.com

Lukas Hottinger.- The Paleocene and earliest Eocene foraminiferal Family Miscellaneidae: neither nummulitids nor rotaliids.- The Miscellaneidae are divided into two groups of species: forms with a single intercameral foramen and forms with two or a row of multiple foramina. Ten taxa ascribed to this family are revised, amply illustrated and discussed considering both micro- and megalospheric generations. The Family Miscellaneidae is assigned to the Superfamily Nonionacea by reason of their planispiral-involute coiling combined with an interiomarginal position of the foramina. Their combined range covers SBZ zones 2-5 and an area comprising the Central and Western Neotethys including the Pyrenean Gulf. They do not reach the western shores of the Atlantic. Miscellanites meandrinus and Bolkarina aksarayi exhibit extreme morphological features, respectively meandrine alar extensions and expanse chambers. These features are of general interest for the comparative anatomy of the shells of the larger foraminifera in order to understand their biological significance.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A06.- Handle-ID: http://hdl.handle.net/2042/28794

2009-09-17T19:01:06Z 2009-09-17T19:01:06Z 2009-09-17T19:01:06Z http://paleopolis.rediris.es/cg/CG2009_B03/ carnetsdegeologie@hotmail.com

Jere H. Lipps (ed.) & Bruno R.C. Granier (ed.).- PaleoParks - The protection and conservation of fossil sites worldwide.<br /> Chapter 1. PaleoParks: Our paleontological heritage protected and conserved in the field worldwide, by Jere H. Lipps<br /> Chapter 2. The Triassic Guanling fossil Group - A key GeoPark from Barren Mountain, Guizhou Province, China, by Xiaofeng Wang, Xiaohong Chen, Chuanshang Wang & Long Cheng<br /> Chapter 3. The GeoPark of Haute-Provence, France - Geology and palaeontology protected for sustainable development, by Jean-Simon Pagès<br /> Chapter 4. The protection and use of the geological and paleontological heritage in Baja California Sur, Mexico, by Javier Gaitán Morán & Alejandro Álvarez Arellano<br /> Capítulo 4. El resguardo y aprovechamiento del patrimonio geológico y paleontológico en Baja California Sur, México, por Javier Gaitán Morán & Alejandro Álvarez Arellano<br /> Chapter 5. Protecting fossil sites in New Zealand, by Bruce W. Hayward<br /> Chapter 6. The Salt Range: Pakistan's unique field museum of geology and paleontology, by Shahid Jamil Sameeni<br /> Chapter 7. Paleontological parks and museums and prominent fossil sites in Thailand and their importance in the conservation of fossils, by Nareerat Boonchai, Paul J. Grote & Pratueng Jintasakul<br /> Chapter 8. Managing fossil resources at the Falls of the Ohio, Indiana and Kentucky, USA: A fossil park in an urban setting, by Alan Goldstein<br /> Chapter 9. Paleo-piracy endangers Vendian (Ediacaran) fossils in the White Sea - Arkhangelsk region of Russia, by Mikhail A. Fedonkin, Andrey Yu. Ivantsov, Maxim V. Leonov, Jere H. Lipps, Ekaterina A. Serezhnikova, Eugeniy I. Malyutin & Yuriy V. Khan<br /> Chapter 10. Copper Canyon track locality (Pliocene) conservation strategies, Death Valley National Park, USA, by Torrey Nyborg<br /> Chapter 11. A possible Late Miocene fossil forest PaleoPark in Hungary, by Géza Császár, Miklós Kázmér, Boglárka Erdei & Imre Magyar.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_B03

2009-09-15T12:47:00Z 2009-09-15T12:47:00Z 2009-09-15T12:47:00Z http://paleopolis.rediris.es/cg/CG2009_A05/ carnetsdegeologie@hotmail.com

Philippe Quereilhac, Didier Marchand, Rémi Jardat, Alain Bonnot, Dominique Fortwengler & Philippe Courville.- La faune ammonitique des marnes à fossiles ferrugineux de la région de Niort, France (Oxfordien inférieur, Zone à Cordatum, Sous-Zone à Cordatum).- The ammonite fauna of the 'marls with ferruginous fossils' from the Niort region, France (Lower Oxfordian, Cordatum Zone, Cordatum Subzone).- A new collection of ammonites from the 'marls with ferruginous ammonites' in the Niort region (France), previously studied by Grossouvre (1922), provides a large amount of biostratigraphic, paleoenvironmental and paleogeographic information. The fauna is dated Early Oxfordian: Cordatum Zone, Cordatum Subzone, probably the lower part of it. In addition, it is unique in western Europe owing to: 1) the species found of which some appear to be known only in this deposit 2) by the extremely atypical domination of the couple Taramelliceras - Creniceras which represent 2/3 of the specimens. Furthermore, the aspect of the fauna strongly suggests that the habitat was a distal platform unknown in other European strata of the same age. A detailed description of the several species is given, sometimes accompanied by a new taxonomic interpretation.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A05.- Handle-ID: http://hdl.handle.net/2042/28697

2009-09-15T12:42:35Z 2009-09-15T12:42:35Z 2009-09-15T12:42:35Z http://paleopolis.rediris.es/cg/CG2009_M02/ carnetsdegeologie@hotmail.com

Philippe Quereilhac.- La Sous-Famille des Taramelliceratinae (Ammonitina, Haploceratoidea, Oppeliidae) de l'Oxfordien moyen et supérieur (Zone à Plicatilis, Sous-Zone à Vertebrale - Zone à Bimammatum, Sous-Zone à Berrense) du Nord de la Vienne, France (Province subméditerranéenne).- Subfamily Taramelliceratinae (Ammonitina, Haploceratoidea, Oppeliidae) from Middle and Upper Oxfordian strata (Plicatilis Zone, Vertebrale Subzone - Bimammatum Zone, Berrense Subzone) of N Vienne, France (submediterranean province).- In the area of northern Poitou studied Taramelliceratinae are present at every level except in the Schilli Subzone, itself possibly absent, and the Stenocycloides Subzone in which only Perisphinctidae and Trimarginites sp. occur. Although some species are known and cited in the literature often, they are figured infrequently or not at all: Taramelliceras (Taramelliceras) dentostriatum (Quenstedt), T. (T.) callicerum (Oppel), T. (Proscaphites) anar (Oppel). Here, the ranges of these species in the stratigraphic succession were determined through their association with other faunas in the same collections, using the presence or absence of known precise stratigraphic markers (for example: Neomorphoceras chapuisi (Oppel) = Transversarium Zone, Luciaeformis Subzone ; Taramelliceras (? Taramelliceras) colleti (Lee) = Rotoides Subzone ; "Epipeltoceras semimammatum" (Quenstedt) = Bimammatum Zone, "Berrense" Subzone, Semimammatum horizon) and/or the disappearance of species with longer ranges (for example: the disappearance of Neoprionoceras lautlingensis (Rollier) which is present in the Parandieri Subzone, but absent in the overlying Luciaeformis Subzone). The ranges of certain species that had been incorrectly located stratigraphically : T. (T.) dentostriatum (Quenstedt), T. (T.) callicerum (Oppel), T. (T.) externnodosum Dorn, have been restored to their true location as determined from their occurrences in the author's collections and in those of other collectors who had noted their stratigraphic relationships to other taxa. It is recommended that the date of creation of the Luciaeformis Subzone and the Nectobrigensis, Luciaeformis and Subschilli horizons (Middle Oxfordian, Transversarium Zone) should be rectified. Currently, these are indicated as having been created in 1984. However, if the author's name, G. Melendez, is correct the date of their creation cannot have been 1984, the year in which the G. Melendez thesis was defended, for the manuscript was published only in 1989. It is also proposed that the Duongi horizon Melendez, 1989, be renamed as the Duongae horizon Melendez, 1989, because the index form, Perisphinctes (Dichotomoceras) duongi Melendez, 1989, is an ammonite species named to honor of A.N. Duong, a woman. The study involved more than fifteen hundred individuals, all collected in the zone investigated. Only the most representative are figured here. The poor state of preservation of the ammonites (encrusted, often worn on one face, with the umbilicus not accessible) did not permit measurement (hence no table) except that of the diameter and sometimes the thickness. Previous studies of this subfamily or these species (Oppel, 1863; Quenstedt, 1887; Loriol, 1902; Lee, 1905; Dorn, 1931; Hölder, 1955) are old. References to this subfamily or its representatives in more recent works are only incidental and rarely include descriptions, drawing or photographs. The existence of many ammonites comprising homogeneous groups but without characteristics in common with known species justifies the creation of new species. Some microconchs have been definitely associated with a macroconch species. For others, a lack of material did not permit the establishment of such a direct link so they have been attached to the supposedly related species with the mention, "aff." (for "affinis"). Nevertheless, although described and figured, these forms remain in open nomenclature. There are some "groups" of ammonites with new characteristics that are here associated with a known species because the differences were not sufficient to create new ones; they are distinguished by "var." (for "variety"). There are also some that are referred to a previously known species because they were based only on a fragment (polymorphism?). In addition, in the zone studied the several taxa of this subfamily permit a relatively detailed stratigraphic breakdown because their existence is limited at a maximum to a subzone. However, an exception is the species Taramelliceras (Proscaphites) anar (Oppel, 1863) which ranges from the Antecedens Subzone through the Rotoides Subzone.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_M02.- Handle-ID: http://hdl.handle.net/2042/28698

2009-08-01T16:54:04Z 2009-08-01T16:54:04Z 2009-08-01T16:54:04Z http://paleopolis.rediris.es/cg/CG2009_L03/ carnetsdegeologie@hotmail.com

Eric Buffetaut.- An additional hadrosaurid specimen (Dinosauria: Ornithischia) from the marine Maastrichtian deposits of the Maastricht area.- An isolated dinosaur vertebra from the marine deposits of the Maastrichtian type area, near the city of Maastricht (The Netherlands), collected during the 19th century and kept in the palaeontological collection of the Museum für Naturkunde in Berlin, is described as a caudal vertebra of a hadrosaurid ornithopod. Although it cannot be identified with greater accuracy, this specimen is an addition to the still scanty, but growing, record of non-avian dinosaurs from the Maastrichtian type area. This record is heavily dominated by hadrosaurs, which probably reflects a real abundance of this group of dinosaurs in the Late Maastrichtian of Europe.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_L03.- Handle-ID: http://hdl.handle.net/2042/28153

2009-08-01T16:51:36Z 2009-08-01T16:51:36Z 2009-08-01T16:51:36Z http://paleopolis.rediris.es/cg/CG2009_L02/ carnetsdegeologie@hotmail.com

Héctor E. Rivera-Sylva, Eberhard Frey & José Rubén Guzmán-Gutiérrez.- Evidence of predation on the vertebra of a hadrosaurid dinosaur from the Upper Cretaceous (Campanian) of Coahuila, Mexico.- In sediments of the Aguja Formation (Late Cretaceous: Campanian) at La Salada in northern part of the state of Coahuila, Mexico, numerous fossils of vertebrates have been discovered including Hadrosauridae. One hadrosaur vertebra provides evidence of predation probably by a giant alligator Deinosuchus riograndensis.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_L02.- Handle-ID: http://hdl.handle.net/2042/28152

2009-05-18T13:21:15Z 2009-05-18T13:21:15Z 2009-05-18T13:21:15Z http://paleopolis.rediris.es/cg/CG2009_A04/ carnetsdegeologie@hotmail.com

Bruno R.C. Granier, Monique Feist, Edward Hennessey, Ioan I. Bucur & Baba Senowbari-Daryan.- The IMAM case. Additional investigation of a micropaleontological fraud.- Starting in 1996 and for almost a decade, M.M. IMAM contributed to twelve papers published in international geological journals. These papers dealt with the micropaleontology and biostratigraphy of Cretaceous to Miocene series from Egypt and Libya. They were abundantly illustrated in order to support the author's findings and interpretations. However most photographic illustrations (189 at least) were fabricated with material lifted from the publications of other authors, commonly from localities or stratigraphic intervals other than those indicated by M.M. IMAM.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A04.- Handle-ID: http://hdl.handle.net/2042/25073

2009-04-22T14:19:49Z 2009-04-22T14:19:49Z 2009-04-22T14:19:49Z http://paleopolis.rediris.es/cg/CG2009_A03/ carnetsdegeologie@hotmail.com

Robert W. Scott.- Uppermost Albian biostratigraphy and chronostratigraphy.- The Albian Stage is the highest chronostratigraphic unit of the Lower Cretaceous Series and underlies the Cenomanian Stage of the Upper Cretaceous Series. The Albian is divided into three substages, each of which is composed of two or three zones based on distinctive and phylogenetically related ammonite assemblages. The uppermost zone of the Upper Albian Substage, the Stoliczkaia dispar Zone, is found in many Western European condensed sections. The ammonite assemblage in the thin glauconitic sandstone near La Vraconne, Switzerland, was defined as the 'Vraconnian Stage' in 1868. However this concept has been little used and was abandoned in 1963 as part of the Cretaceous chronostratigraphic scale. A recent proposal to resurrect and redefine this stage is based on a number of criteria and very detailed and reliable stratigraphic data. A quantitative biostratigraphic analysis of the ammonite ranges in the key sections shows that the proposed subzones of the S. dispar Zone have discordant ranges. Furthermore, the utility of a 'Vraconnian Stage' between the Albian and Cenomanian stages is geographically limited and the concept embraces one of many depositional sequence cycles of the Albian. The reinstatement of a 'Vraconnian Stage' is not recommended.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A03.- Handle-ID: http://hdl.handle.net/2042/24969

2009-04-04T19:33:53Z 2009-04-04T19:33:53Z 2009-04-04T19:33:53Z http://paleopolis.rediris.es/cg/CG2009_A02/ carnetsdegeologie@hotmail.com

Didier Bert & Gérard Delanoy.- Pseudoshasticrioceras bersaci nov. sp. (Ammonoidea, Gassendiceratinae), and new ammonite biohorizon for the Upper Barremian of southeastern France.- Research in the Feraudianus Subzone of the Sartousiana Zone of the Barremian stage led to the discovery of a new species of Pseudoshasticrioceras: P. bersaci nov. sp. Its study provides evidence concerning the developments of the latest Gassendiceratinae Bert et alii, 2006, and the relationship between the genus Pseudoshasticrioceras Delanoy, 1998, and Gassendiceras Bert et alii, 2006. In particular, this new species is derived from Pseudoshasticrioceras magnini (Delanoy, 1992) by a minor revision in the processes of ontogenesis (retardation of ornamentation - neoteny). However, the evolution towards Pseudoshasticrioceras autrani Delanoy, 1998, implies a "failure" in this process that may possibly be related to parallel changes in environmental conditions. On the other hand, the very closely defined stratigraphic position of Pseudoshasticrioceras bersaci nov. sp., and its position in the anagenetic lineage of Pseudoshasticrioceras, demonstrates its interest as a biostratigraphic marker: a new Bersaci Biohorizon is proposed; it is located between the Magnini and the Autrani biohorizons.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A02.- Handle-ID: http://hdl.handle.net/2042/23733

2009-04-04T19:31:24Z 2009-04-04T19:31:24Z 2009-04-04T19:31:24Z http://paleopolis.rediris.es/cg/CG2009_A01/ carnetsdegeologie@hotmail.com

Jean-François Babinot, Jean-Paul Colin & Auran Randrianasolo.- Les ostracodes de l'Albien-Turonien moyen de la région d'Antsiranana (Nord Madagascar) : systématique, paléoécologie et paléobiogéographie.- Des associations d'ostracodes provenant de la région d'Antsiranana, ex Diego-Suarez, dans le N de Madagascar ont été étudiées au niveau systématique. Dans l'intervalle Albien-Turonien moyen, 29 espèces appartenant à 21 genres ont été reconnues, 10 nouvelles espèces, un nouveau genre (Malagasyella) et un nouveau sous-genre (Hemiglenocythere) ont été créés. L'Albien ainsi que le Cénomanien inférieur se caractérisent par des associations bien différenciées. D'un point de vue paléoécologique, la succession des faunes d'ostracodes montre une baisse progressive du niveau de la mer d'un milieu de bassin-talus à l'Albien à un environnement de plate-forme externe au Turonien. Pendant cette période les faunes d'ostracodes de Madagascar montrent de fortes affinités avec celles de l'Inde (Rajasthan) ce qui mène à proposer l'existence de province faunistique indo-malgache.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_A01.- Handle-ID: http://hdl.handle.net/2042/23730

2009-03-31T19:27:37Z 2009-03-31T19:27:37Z 2009-03-31T19:27:37Z http://paleopolis.rediris.es/cg/CG2009_L01/ carnetsdegeologie@hotmail.com

Margarita Simeoni.- Nannofósiles del Serravalliano (Mioceno) en Patagonia, Argentina - Serravallian (Miocene) nannofossils in Patagonia, Argentina.- For the first time, nannofossils found in the marine stratigraphic unit named "Patagoniano" which crops out at Cerro Chenque and Cerro Hermitte in southeastern Chubut, Argentina, are documented. They were recovered from pelitic levels in the lower part of coarsening-upward siliciclastic sedimentary sequences. The nannofossils are assigned in part to the Discoaster kugleri Zone NN7 (Martini, 1971) and CN5b (Bukry, 1971, 1973) thus allowing correlation of the productive levels with the Serravallian Stage (upper Middle Miocene).- SRef-ID: http://overview.sref.org/1634-0744/CG2009_L01.- Handle-ID: http://hdl.handle.net/2042/23731

2009-03-31T19:24:59Z 2009-03-31T19:24:59Z 2009-03-31T19:24:59Z http://paleopolis.rediris.es/cg/CG2009_M01/ carnetsdegeologie@hotmail.com

Nico M.M. Janssen.- Mediterranean Neocomian belemnites, part 3: Valanginian-Hauterivian belemnites.- The classical papers of Raspail (1829, 1830) and Duval-Jouve (1841) described a wide range of belemnite species, mainly from the Lower Cretaceous of the Castellane-Peyroules area (Alpes de Haute-Provence, France). The present work focuses mainly on the biostratigraphy of these previously described belemnite taxa for their stratigraphic relationships had not been determined precisely. Here, biostratigraphy is related to the lithologic successions and faunal associations (ammonites) of various outcrops in the area studied. Complementary data were obtained from the La Lagne, Les Allaves and Pas d'Escale sections (Alpes de Haute-Provence, France). And, in order to attain a better understanding of the stratigraphic distribution of Late Valanginian belemnites in condensed glauconitic deposits, these assemblages are compared with belemnites from deeper water successions in the Angles, Source de l'Asse de Moriez, Cheiron areas and those in the vicinity of La Charce and Vergol that are even deeper.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_M01.- Handle-ID: http://hdl.handle.net/2042/23732

2009-01-20T13:24:39Z 2009-01-20T13:24:39Z 2009-01-20T13:24:39Z http://paleopolis.rediris.es/cg/CG2009_SP01/ carnetsdegeologie@hotmail.com

Patrick Génot.- Cenozoic Dasycladales. A photo-atlas of Lutetian species from French Cenozoic basins,.- Dasycladales are unicellular green algae in existence since the Paleozoic era. Dasycladales discovered in the Cenozoic strata of the French sedimentary basins are noteworthy for the exceptional quality of their preservation. Although most fossil Dasycladales are known only in thin sections, the coatings of the Dasycladales in these basins, particularly of those in Lutetian beds, are easy to extract from sandy sediments and then are examined under the electron microscope. This method of investigation facilitates greatly the identification of the external and internal features of each species.- SRef-ID: http://overview.sref.org/1634-0744/CG2009_SP01.- Handle-ID: http://hdl.handle.net/2042/21981

2008-12-10T14:00:00Z 2008-12-10T14:00:00Z 2008-12-10T14:00:00Z http://paleopolis.rediris.es/cg/CG2008_A09/ carnetsdegeologie@hotmail.com

Elizabeth A. Stephens, Olivier Braissant & Pieter T. Visscher.- Spirochetes and salt marsh microbial mat geochemistry: Implications for the fossil record.- Microbial mats are synergistic microbial consortia through which major elements, including sulfur, are cycled due to microbial and geological processes. Depth profiles of pH, O2, sulfide, exopolymeric substances (EPS), and the rate of sulfate reduction were determined in an Oscillatoria sp. and Microcoleus-dominated marine microbial mat at the Great Sippewissett salt marsh, Massachusetts. In addition, measurements in spirochete enrichments and Spirochaetae litoralis cultures showed sulfide consumption during which polysulfides, thiosulfate, and presumably sulfate formed. These data suggest that spirochetes can play a role in the cycling of sulfur in these mats. The obligate to facultative anaerobic spirochetes may consume sulfide to remove oxygen. Furthermore, spirochetes may enhance preservation of microbial mats within the rock record by degrading EPS and producing low molecular weight organic compounds (LMWOC). Both sulfide oxidation (i.e., oxygen removal) and EPS degradation (i.e., production of LMW organic compounds) stimulate the activity of sulfate-reducing bacteria (SRB), which are responsible for the precipitation of calcium carbonate in most lithifying mats.- SRef-ID: http://overview.sref.org/1634-0744/CG2008_A09.- Handle-ID: http://hdl.handle.net/2042/20045

2008-12-10T14:00:00Z 2008-12-10T14:00:00Z 2008-12-10T14:00:00Z http://paleopolis.rediris.es/cg/CG2008_A08/ carnetsdegeologie@hotmail.com

Christian C. Emig.- On the history of the names Lingula, anatina, and on the confusion of the forms assigned them among the Brachiopoda.- The first descriptions of Lingula were made from then extant specimens by three famous French scientists: Bruguière, Cuvier, and Lamarck. The genus Lingula was created in 1791 (not 1797) by Bruguière and in 1801 Lamarck named the first species L. anatina, which was then studied by Cuvier (1802). In 1812 the first fossil lingulids were discovered in the Mesozoic and Palaeozoic strata of the U.K. and were referred to Lingula on the basis of similarity in the form of the shell. In the 1840's other linguliform brachiopods from the Palaeozoic were described. The similarity of the shell form of the extant Lingula and these fossils led Darwin in 1859 to create the description "living fossil" in his book "On the Origin of Species". Thereafter, this Darwinian concept became traditional in that Lingula was considered to lack morphological evolutionary changes. Although denounced as scientifically incorrect for more than two decades, the concept still remains in many books, publications and Web sites, perhaps a witness to palaeontological conservatism.- SRef-ID: http://overview.sref.org/1634-0744/CG2008_A08.- Handle-ID: http://hdl.handle.net/2042/20044

2008-09-28T14:00:00Z 2008-09-28T14:00:00Z 2008-09-28T14:00:00Z http://paleopolis.rediris.es/cg/CG2008_M04/ carnetsdegeologie@hotmail.com

Bernard Joly & Michel Delamette.- Les Phylloceratoidea (Ammonoidea) aptiens et albiens du bassin vocontien (Sud-Est de la France).- L'étude de plus de 2200 spécimens de Phylloceratoidea (Cephalopoda, Ammonoidea) récoltés dans les dépôts aptiens et albiens du bassin vocontien (Sud-Est de la France) a permis l'identification et la description de 28 taxons repérés stratigraphiquement à l'échelle de la zone d'ammonite. Quatre nouveaux taxons sont décrits : Phylloceras (Hypophylloceras) moriezense Sayn, 1920 tenuicostulata nov. subsp. (base de l'Aptien supérieur), Phylloceras (Goretophylloceras) vocontium nov. sp. (sommet de l'Aptien moyen à base de l'Albien inférieur), Salfeldiella (Gyrophyllites) falloti nov. sp. (sommet de l'Aptien inférieur à base de l'Aptien supérieur), Phyllopachyceras brehereti nov. sp. (base de l'Aptien moyen à base de l'Aptien supérieur).- SRef-ID: http://overview.sref.org/1634-0744/CG2008_M04.- Handle-ID: http://hdl.handle.net/2042/19113

2008-09-28T14:00:00Z 2008-09-28T14:00:00Z 2008-09-28T14:00:00Z http://paleopolis.rediris.es/cg/CG2008_A07/ carnetsdegeologie@hotmail.com

Bruno Granier.- Holostratigraphy of the Kahmah regional Series in Oman, Qatar, and the United Arab Emirates.- The stratigraphic framework of the uppermost Jurassic - Lower Cretaceous interval of the Gulf area is revised using both historical and recently acquired paleontological (ammonites, calpionellids, foraminifers, 'calcareous' algae), sedimentological and sequential information. The Kahmah regional Series ranging in age from Late Tithonian to Gargasian (= middle Aptian) times is subdivided into regional stages, named from bottom to top: Rayda (with two substages, Bu Haseer and Belbazem), Salil, Zakum, Lekhwair, Kharaib, Hawar, and Shu'aiba. The Kahmah rests either on strata representing the Habshan regional Stage, which is the last term of the Sahtan regional Series (locally absent due to a stratigraphic hiatus in basinal areas), or on much older strata; it is followed either by the Bab regional Stage (locally absent due to a stratigraphic hiatus on platform areas), or by the Sabsab regional Substage (the lowermost part of the Nahr Umr regional Stage), both of which are assigned the Wasi'a regional Series. The Kahmah succession (as well as those of the Sahtan below and the Wasi'a above) is discontinuous, i.e. punctuated by sedimentary hiatuses due to forced regressions, some of significant importance (in the Zakum or in the Bab, and those bounding the Hawar and the Shu'aiba).- SRef-ID: http://overview.sref.org/1634-0744/CG2008_A07.- Handle-ID: http://hdl.handle.net/2042/19112

2008-09-07T14:00:00Z 2008-09-07T14:00:00Z 2008-09-07T14:00:00Z http://paleopolis.rediris.es/cg/CG2008_BOOK_01/ carnetsdegeologie@hotmail.com

Emanuela Mattioli, Silvia Gardin, Fabienne Giraud, Davide Olivero, Bernard Pittet & Stéphane Reboulet.- 12th Meeting of the International Nannoplankton Association (Lyon, September 7-10, 2008).- Guidebook for the post-congress fieldtrip in the Vocontian Basin, SE France (September 11-13, 2008).- SRef-ID: http://overview.sref.org/1634-0744/CG2008_BOOK_01.- Handle-ID: http://hdl.handle.net/2042/18137

2008-08-27T00:00:01Z 2008-08-27T00:00:01Z 2008-08-27T00:00:01Z http://paleopolis.rediris.es/cg/CG2008_L03/ carnetsdegeologie@hotmail.com

Pierre Ropolo, Michel Moullade, Gabriel Conte & Guy Tronchetti.- About the stratigraphic position of the Lower Aptian Roloboceras hambrovi (Ammonoidea) level.- In the stratotype of the Lower Aptian substage the position of the assemblage that includes Roloboceras spp. and Megatyloceras spp. has been clearly established as being in the middle part of the upper Bedoulian. Some authors have erected this horizon as a subzone, or even a zone, with R. hambrovi as species-index. In other areas (southern England, eastern Spain, the Ardèche in southeastern France), where taphonomic conditions are not always as favourable as they are in the stratotype, the level at which this assemblage occurs seems to be confined to the upper part of the lower Bedoulian. Various hypotheses are considered in an attempt to explain this divergence.- SRef-ID: http://overview.sref.org/1634-0744/CG2008_L03.- Handle-ID: http://hdl.handle.net/2042/18124

2008-08-27T00:00:02Z 2008-08-27T00:00:02Z 2008-08-27T00:00:02Z http://paleopolis.rediris.es/cg/CG2008_M03/ carnetsdegeologie@hotmail.com

Pierre Ropolo, Gabriel Conte, Michel Moullade, Guy Tronchetti & Roland Gonnet.- The Douvilleiceratidae (Ammonoidea) of the Lower Aptian historical stratotype area at Cassis-La Bédoule (SE France).- Recent biostratigraphic research in the marly limestones of the Cassis-La Bédoule area (SE France) provided a rich macrofauna of Douvilleiceratidae Parona & Bonarelli, 1897. From the uppermost Barremian (Pseudocrioceras waagenoides Subzone) to the middle Aptian (Parahoplites melchioris Zone), specimens of Procheloniceras, Cheloniceras, Roloboceras, Megatyloceras and Epicheloniceras were collected in succession. In this paper we describe the various genera and species from this material and delimit precisely their stratigraphic positions. Our study shows that each genus or subgenus characterizes a discrete stratigraphic interval. In addition, the Cheloniceras meyendorffi (upper Bedoulian), Epicheloniceras debile, Epicheloniceras gracile, and Epicheloniceras buxtorfi (Gargasian = middle Aptian) subzones, originally defined in England by Casey (1961a), are identified for the first time in the Lower Aptian stratotypic area of Cassis-La Bédoule.- SRef-ID: http://overview.sref.org/1634-0744/CG2008_M03.- Handle-ID: http://hdl.handle.net/2042/18125

2008-08-01T08:00:00Z 2008-08-01T08:00:00Z 2008-08-01T08:00:00Z http://paleopolis.rediris.es/cg/CG2008_A06/ carnetsdegeologie@hotmail.com

Hamid Haddoumi, André Charrière, Bernard Andreu & Pierre-Olivier Mojon.- Les dépôts continentaux du Jurassique moyen au Crétacé inférieur dans le Haut Atlas oriental (Maroc) : paléoenvironnements successifs et signification paléogéographique.- Dans le Haut Atlas oriental marocain, les "Couches rouges" continentales succédant aux dernières formations marines jurassiques sont organisées en trois grands ensembles lithostratigraphiques : la Formation d'Anoual, la Formation de Ksar Metlili et le Groupe de Dekkar, séparés par deux importantes ruptures de l'enregistrement sédimentaire. La Formation d'Anoual correspond à des dépôts de plaine deltaïque à dominante fluviatile, suivis d'une ultime incursion marine d'âge Bathonien inférieur. La Formation de Ksar Metlili est uniquement localisée dans certaines aires subsidentes et représente un deuxième cycle fluvio-deltaïque avec des charophytes d'âge Tithonien terminal-Berriasien inférieur. Le Groupe de Dekkar traduit l'installation d'une nouvelle aire de sédimentation recouvrant l'ensemble de la région avec trois environnements successifs : cônes alluviaux associés à une sédimentation lacustre du Barrémien?-Aptien à charophytes et ostracodes, puis dépôts de plaines alluviales, enfin plaines et lagunes côtières au Cénomanien. Les "Couches rouges" continentales du domaine atlasique oriental correspondent ainsi à l'enregistrement sédimentaire de trois événements géodynamiques distincts : • une phase de comblement du sillon atlasique, associée à une forte subsidence dénotant une poursuite du rifting atlasique au Bathonien inférieur ; • une période d'émersion généralement marquée par une lacune du Bathonien au Barrémien-Aptien, mais au cours de laquelle subsiste une sédimentation résiduelle dans certaines cuvettes intra-continentales à la limite Jurassique/Crétacé ; • une phase d'ouverture générant au Barrémien?-Aptien de nouveaux bassins continentaux qui évoluent vers des conditions marines jusqu'à la transgression du Cénomanien-Turonien. La comparaison de cet enchaînement avec celui enregistré dans d'autres secteurs du domaine atlasique permet de retracer les trois phases de l'évolution paléogéographique de ces segments sud-téthysiens entre le Jurassique moyen et le Crétacé supérieur.- SRef-ID: http://overview.sref.org/1634-0744/CG2008_A06.- Handle-ID: http://hdl.handle.net/2042/18122

2008-05-17T12:00:02Z 2008-05-17T12:00:02Z 2008-05-17T12:00:02Z http://paleopolis.rediris.es/cg/CG2008_L02/ carnetsdegeologie@hotmail.com

Amédro Francis & Robaszynski, Francis.- Since the end of the 19th century the interval comprising the uppermost Upper Albian, the Cenomamian, the Turonian and the basal Coniacian has been subdivided, first into ammonite zones, then, beginning in the middle of the 20th century, into zones of planktonic foraminifera. These two groups, one macrofossil, the other microfossil, are particularly effective for bio-chronostratigraphy thanks to their rapid rates of evolution. But differences in the faunal makeup between the Boreal domain (northwestern Europe) and the Tethyan domain (Mediterranean) have for a long time hindered precise correlation of the two domains. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_L02 Handle-ID: http://hdl.handle.net/2042/17066

2008-05-17T12:00:01Z 2008-05-17T12:00:01Z 2008-05-17T12:00:01Z http://paleopolis.rediris.es/cg/CG2008_L02/index-fr.html carnetsdegeologie@hotmail.com

Amédro Francis & Robaszynski, Francis.- Depuis la fin du 19ème siècle, l'intervalle comprenant l'Albien supérieur élevé, le Cénomanien, le Turonien et le Coniacien basal a été subdivisé d'abord en zones d'ammonites puis, à partir du milieu du 20ème siècle, en zones de foraminifères planctoniques, deux groupes de macro- et de microfossiles particulièrement efficaces en bio-chronostratigraphie grâce à leur taux d'évolution rapide. Toutefois, des différences de compositions fauniques entre le domaine boréal (Europe du Nord-Ouest) et le domaine téthysien (Méditerranée) ont longtemps empêché des corrélations précises entre ces deux domaines. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_L02-fr http://hdl.handle.net/2042/17065

2008-05-17T11:00:00Z 2008-05-17T11:00:00Z 2008-05-17T11:00:00Z http://paleopolis.rediris.es/cg/CG2008_M02/ carnetsdegeologie@hotmail.com

Amédro, Francis.- The geological scale for the middle Cretaceous currently used throughout the world was proposed by Alcide d'Orbigny in the XIXth century between the years 1842 and 1847 and establishes the succession of stages as Albian, Cenomanian and Turonian. In 1868 Renevier proposed that a supplemental chronostratigraphic division be intercalated between the Albian and the Cenomanian: the Vraconnian stage. This term was not generally accepted and after a period when it was referred to by Breistroffer (1936) as a substage constituting the upper part of the Albian, as an equivalent of the Stoliczkaia dispar ammonite Zone, its abandonment was "recommended" by the Conference on the Lower Cretaceous held in Lyon in 1963. The conditions that led to this "decision" will be discussed herein. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_M02 Handle-ID: http://hdl.handle.net/2042/17063

2008-04-17T15:00:00Z 2008-04-17T15:00:00Z 2008-04-17T15:00:00Z http://paleopolis.rediris.es/cg/CG2008_A05/ carnetsdegeologie@hotmail.com

Bonnot Alain, Boursicot Pierre-Yves, Ferchaud Patrice & Marchand Didier.- Dans la région de Montreuil-Bellay (Maine-et-Loire), de nombreuses coupes ont été réalisées au passage Callovien moyen-Callovien supérieur. Le premier banc attribué au Callovien supérieur a été daté de l'horizon à Leckenbyi. Il a fourni une très importante faune ammonitique (N=3125), dans laquelle les Perisphinctidae représentent 51% de l'effectif. À côté de formes plus ou moins bien connues comme Pseudopeltoceras leckenbyi (Bean), Orionoides pseudorion (Waagen), Subgrossouvria famulum (Bean) et S. crassa Gérard et Contaut, on trouve une espèce qui n'a jamais été ni décrite ni figurée : cette espèce fait l'objet du présent article. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_A05 Handle-ID: http://hdl.handle.net/2042/16929

2008-03-22T15:00:01Z 2008-03-22T15:00:01Z 2008-03-22T15:00:01Z http://paleopolis.rediris.es/cg/CG2008_M01/ carnetsdegeologie@hotmail.com

Odin Gilles Serge.- L'étude des microfossiles extraits par acétolyse des niveaux carbonatés indurés de la série campano-maastrichtienne du stratotype de limite à Tercis (Landes, France) a permis de découvrir 44 taxons attribués au groupe des gilianelles (microproblematica appartenant probablement aux Protistes, Protozoaires, Rhizopodes) ainsi que dix autres microproblematica. 281 vues au microscope électronique et 183 vues au microscope optique permettent d'illustrer, chez les gilianelles, 36 espèces, et 8 sous-espèces appartenant à 15 genres dont 14 nouveaux. Les nouveaux genres sont : Tercensella, Azymella, Numismella, Aturella, Scutellella, Corniculum, Caccabella, Orculiella, Pennigerella, Corbella Aquilegiella, Pocillella, Coraliella, Obbella. Chez les autres microproblematica, neuf espèces et une sous-espèce sont proposées appartenant à sept genres nouveaux : Globulella, Piperella, Vasculum, Lucernellus, Cimicellus, Tubella, Pilella. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_M01 Handle-ID: http://hdl.handle.net/2042/14858

2008-03-22T15:00:00Z 2008-03-22T15:00:00Z 2008-03-22T15:00:00Z http://paleopolis.rediris.es/cg/CG2008_A04/ carnetsdegeologie@hotmail.com

Plaziat Jean-Claude, Reyss Jean-Louis, Choukri Abdelmajid & Cazala Charlotte.- This paper is a general review of the dating of reefs on the coasts of the Red Sea, including those of Egypt, Jordan, Sudan, Eritrea, Saudi Arabia and Djibouti. New methods of sampling and dating (U/Th) already tested on the reefs and associate deposits of the African coast of Egypt have demonstrated that processes of rejuvenation shown to exist in the best-preserved corals are probably attributable to the diagenesis of the organic material in their bio-minerals, thus justifying a revision of a great many datings of corals supposedly younger or older than the age assigned to the high-level isotopic substage (Δ18O) MIS 5.5 (= 5e). During this late Pleistocene substage, a rapid lowering of sea level, short and limited to about ten meters, was detected and associated with a glacio-eustatic episode of global influence. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_A04 Handle-ID: http://hdl.handle.net/2042/16743

2008-03-20T15:00:00Z 2008-03-20T15:00:00Z 2008-03-20T15:00:00Z http://paleopolis.rediris.es/cg/CG2008_A03/ carnetsdegeologie@hotmail.com

Bert Didier, Delanoy Gérard & Bersac Stéphane.- Un nouveau découpage biozonal ammonitique du Barrémien supérieur du Sud-Est de la France est proposé. Il tient compte des renouvellements fauniques, des données séquentielles ainsi que des données historiques. Il est enrichi de quatre biohorizons nouveaux. Le Barrémien supérieur comporte à présent les trois biozones (anciennement six) à Vandenheckei, Sartousiana et Giraudi. La première contient les trois sous-zones à Uhligi, dont le statut est discuté, Sayni et Barremense, ainsi que les deux nouveaux biohorizons à Marchandi et Breistrofferi (sommet de la Sous-Zone à Barremense). La Biozone à Sartousiana admet les sous-zones à Limentinus, Provincialis et Feraudianus. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_A03 Handle-ID: http://hdl.handle.net/2042/16737

2008-02-04T15:00:02Z 2008-02-04T15:00:02Z 2008-02-04T15:00:02Z http://paleopolis.rediris.es/cg/CG2008_L01/ carnetsdegeologie@hotmail.com

Baudin François, Moullade Michel & Tronchetti Guy.- The Total Organic Carbon (TOC) content of the Gargasian strata studied in their historical stratotype area is rather low (0.3% on average). Only a few levels show TOC values approaching 1.2%. This small amount of preserved organic matter, associated with low hydrogen index values (10 to 115 mg hydrocarbons/g TOC), argues for deposition in fully oxic conditions. This organic content is a mixture of land-derived organic particles and deeply oxidised marine organic matter. The organic flux was strongly diluted by the autochthonous carbonate input. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_L01 Handle-ID: http://hdl.handle.net/2042/14860

2008-02-04T15:00:01Z 2008-02-04T15:00:01Z 2008-02-04T15:00:01Z http://paleopolis.rediris.es/cg/CG2008_A02/ carnetsdegeologie@hotmail.com

Andreu Bernard & Odin Gilles Serge.- Through the use of acetolysis new micropalaeontological studies on the type section of the Campanian-Maastrichtian boundary at Tercis (SW France) we obtained additional information on ostracodes. Acetolysis on hard carbonates levels of the Tercis quarry found 22 species in addition to those of the studies published in 2001. Today, 75 species are recognized: they represent 34 known genera, and 4 currently unidentified. Small species usually rare of the genera Aversovalva, Bythoceratina and Eucytherura were collected. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_A02 Handle-ID: http://hdl.handle.net/2042/14857

2008-02-04T15:00:00Z 2008-02-04T15:00:00Z http://paleopolis.rediris.es/cg/CG2008_A02/index-fr.html carnetsdegeologie@hotmail.com

Andreu Bernard & Odin Gilles Serge.- Une nouvelle étude de la microfaune, obtenue par acétolyse des niveaux indurés dans le Campanien-Maastrichtien de la carrière de Tercis, a permis de récolter 22 espèces additionnelles au regard de l'étude publiée en 2001 et de porter ainsi à 75 espèces, réparties sur 34 genres reconnus et 4 indéterminés, la biodiversité en ostracodes de ce site. Des espèces de petite taille, généralement rares, rapportées aux genres Aversovalva, Bythoceratina et Eucytherura ont par ailleurs été recueillies. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_A02(fr) Handle-ID: http://hdl.handle.net/2042/14858

2008-01-28T15:00:00Z 2008-01-28T15:00:00Z 2008-01-28T15:00:00Z http://paleopolis.rediris.es/cg/CG2008_A01/ carnetsdegeologie@hotmail.com

Moullade Michel, Tronchetti Guy & Bellier Jean-Pierre.- Faisant suite aux recherches sur le Bédoulien et le Gargasien du secteur de Cassis-La Bédoule (B. du Rh., SE France), l'étude de quatre coupes en relais dans l'aire stratotypique de l'Aptien, situées dans le secteur du Hameau de la Tuilière (commune de Saint-Saturnin-lès-Apt, Vaucluse, SE France) a permis l'analyse détaillée des associations de foraminifères benthiques (30 taxons) et planctoniques (15 taxons) du Bédoulien supérieur et du Gargasien inférieur. Descriptions, figurations et répartition stratigraphique sont fournies pour les formes les plus significatives, avec individualisation de plusieurs marqueurs, benthiques et surtout planctoniques. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2008_A01 Handle-ID: http://hdl.handle.net/2042/14699

2007-11-01T15:00:00Z 2007-11-01T15:00:00Z 2007-11-01T15:00:00Z http://paleopolis.rediris.es/cg/CG2007_A07/ carnetsdegeologie@hotmail.com

Elicki, Olaf.- The transgressive Tayan Member of the upper Lower to Middle Cambrian Burj Formation (Jordan) has been investigated in several localities of the Dead Sea Rift valley, Jordan. The lower portion of this member consists of low-energy siliciclastics with indications of temporary, early pedogenetic processes, pointing to some stagnation during transgression. The upper portion of the member was deposited under higher energy conditions. Stromatolites, desiccation cracks, halite-pseudomorphs, laminated dolostones, and tepees, together with ripples, mud-clasts and scours point to a shallow intertidal to supratidal sabkha-related environment in a climate of tropical to subtropical aridity. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_A07 Handle-ID: http://hdl.handle.net/2042/9717

2007-09-25T15:00:00Z 2007-09-25T15:00:00Z 2007-09-25T15:00:00Z http://paleopolis.rediris.es/cg/CG2007_A06/ carnetsdegeologie@hotmail.com

Hottinger, Lukas.- The definition of the type species of the genus Globoreticulina RAHAGHI, 1978, G. iranica RAHAGHI, 1978, is emended and its age discussed in relation to those of 17 associated taxa of larger foraminifera, all from restricted shallow environments. These taxa represent porcelaneous groups of spiroline habit including Rhabdorites malatyaensis, archaiasines (Archaias operculiniformis and A. diyarbakirensis), agglutinated conicals (Coskinolina and Dictyoconus) and some rotaliids (Medocia and others). (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_A06 Handle-ID: http://hdl.handle.net/2042/9213

2007-07-25T15:00:00Z 2007-07-25T15:00:00Z 2007-07-25T15:00:00Z http://paleopolis.rediris.es/cg/CG2007_A05/ carnetsdegeologie@hotmail.com

Babinot, Jean-François; Moullade, Michel; Tronchetti, Guy.- In the vicinity of Saint-Saturnin-lès-Apt (Vaucluse, SE France), which is included in the area of the historic Aptian stratotype of Apt-Gargas, are four sections in a succession that permits the study in a very detailed and continuous way of the last beds of the upper Bedoulian and those of the lower Gargasian. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_A05 Handle-ID: http://hdl.handle.net/2042/8877

2007-07-02T16:00:00Z 2007-07-02T16:00:00Z 2007-07-02T16:00:00Z http://paleopolis.rediris.es/cg/CG2007_A04/ carnetsdegeologie@hotmail.com

Knappertsbusch, Michael.- Variability in the test of Globorotalia menardii during the past 8 million years has been investigated at DSDP Site 502A (Caribbean Sea) and DSDP Site 503A (Eastern Equatorial Pacific). (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_A04 Handle-ID: http://hdl.handle.net/2042/8455

2007-07-02T15:00:00Z 2007-07-02T15:00:00Z 2007-07-02T15:00:00Z http://paleopolis.rediris.es/cg/CG2007_A03/ carnetsdegeologie@hotmail.com

Renard, Maurice; Rafélis, Marc de; Emmanuel, Laurent; Beltran, Catherine; Moullade, Michel; Tronchetti, Guy.- In the Lower Aptian historical stratotype area (Cassis-La Bédoule, SE France), a geochemical study of the Gargasian (Middle Aptian) marl-limestone alternations of the La Marcouline quarry complements data already obtained from Bedoulian (Early Aptian) sediments there. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_A03 Handle-ID: http://hdl.handle.net/2042/8454

2007-05-24T15:00:00Z 2007-05-24T15:00:00Z 2007-05-24T15:00:00Z http://paleopolis.rediris.es/cg/CG2007_A02/ carnetsdegeologie@hotmail.com

Kuhnt, Wolfgang; Moullade, Michel.- Bulk rock stable isotope analysis of La Marcouline section (Cassis-La Bédoule area, SE France) revealed a general trend of decreasing δ13C and δ18O values from the bottom to the top of the section. The decrease in δ13C values reflects a global trend in Middle Aptian times, namely a return to pre-excursion values of δ13C values following a major, positive excursion in the Early Aptian, which is a reflection of the Oceanic Anoxic Event (OAE) 1a. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_A02 Handle-ID: http://hdl.handle.net/2042/8044

2007-05-15T19:00:00Z 2007-05-15T19:00:00Z 2007-05-15T19:00:00Z http://paleopolis.rediris.es/cg/CG2007_M02/ carnetsdegeologie@hotmail.com

Bulot, Luc G.; Ferry, Serge; Grosheny, Danièle (eds.).- A set of 11 abstracts and short papers (extended abstracts) of presentations given during a meeting organized by the "Groupe Français du Crétacé", held on November 27-28, 2006 at the École des Mines de Paris. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_M02 Handle-ID: http://hdl.handle.net/2042/8029

2007-04-04T19:00:00Z 2007-04-04T19:00:00Z 2007-04-04T19:00:00Z http://paleopolis.rediris.es/cg/CG2007_L01/ carnetsdegeologie@hotmail.com

Siva, Hilda Maria Andrade da; Gallo, Valéria.- Parsimony analysis of endemicity was applied to analyze the distribution of enchodontoid fishes occurring strictly in the Cenomanian. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_L01 Handle-ID: http://hdl.handle.net/2042/7146

2007-03-22T19:00:00+01:00 2007-03-22T19:00:00+01:00 2007-03-22T19:00:00+01:00 http://paleopolis.rediris.es/cg/CG2007_M01/ carnetsdegeologie@hotmail.com

Steemans, Philippe; Javaux, Emmanuelle (eds.).- A set of 11 abstracts and short papers (extended abstracts) of presentations given during a meeting organized by the NFSR Working Group, "Micropaléontologie végétale et Palynologie (MVP)", held on May 24, 2006 at the University of Liège, Belgium. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_M01 Handle-ID: http://hdl.handle.net/2042/7042

2007-02-27T15:00:00Z 2007-02-27T15:00:00Z 2007-02-27T15:00:00Z http://paleopolis.rediris.es/cg/CG2007_A01/ carnetsdegeologie@hotmail.com

Beltran, Catherine; Rafélis, Marc de; Renard, Maurice; Moullade, Michel; Tronchetti, Guy.- Limestone-marl alternations are usually interpreted to reflect cyclic paleoenvironmental fluctuations linked to Milankovitch-scale climate variations. However, the impact of diagenesis on lithological differentiation can be overprinted on the primary signal. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_A01 Handle-ID: http://hdl.handle.net/2042/6828

2006-12-14T15:00:00Z 2006-12-14T15:00:00Z 2006-12-14T15:00:00Z http://paleopolis.rediris.es/cg/CG2006_A05/ carnetsdegeologie@hotmail.com

Odin, Gilles Serge; Lethiers, Alexandre.- New micropalaeontological studies on the stratotype of the Campanian-Maastrichtian boundary at Tercis (SW France): the gilianelles (microproblematica) extracted through acetolysis. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_A05 Handle-ID: http://hdl.handle.net/...

2006-09-26T15:00:00Z 2006-09-26T15:00:00Z 2006-09-26T15:00:00Z http://paleopolis.rediris.es/cg/CG2006_BOOK_01/ carnetsdegeologie@hotmail.com

Teyssèdre, Bernard.- L'ouvrage présenté ici a pour base un différend qui oppose l'auteur à Andrew Knoll, qui situe l'apparition des algues vertes vers 750 Ma. Bernard Teyssèdre analyse ce probléme par les méthodes qu'il préconisait dans "La vie invisible" combinant à la palèontologie descriptive traditionnelle, les analyses ultrastructurales et biochimiques et confrontant ces résultats avec ceux de la phylogénie moléculaire. Manié avec discernement et compétence, cet outil ne permet certes pas d'établir une taxinomie exacte, mais d'écarter les taxinomies erronées basées sur des convergences et de déterminer la succession des points nodaux dans l'évolution d'une lignée. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_B01 Handle-ID: http://hdl.handle.net/2042/5845

2006-09-21T15:00:00Z 2006-09-21T15:00:00Z 2006-09-21T15:00:00Z http://paleopolis.rediris.es/cg/CG2006_A04/ carnetsdegeologie@hotmail.com

Emig, Christian C.- Large collections of the brachiopod obolid Schmidtites celatus have been gathered from Upper Cambrian-Lower Ordovician strata in four northern Estonian localities. The morphological features and the taxonomic characters of the genus and of the single species representing it are re-described and illustrated. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_A04 Handle-ID: http://hdl.handle.net/2042/5837

2006-09-19T15:00:00Z 2006-09-19T15:00:00Z 2006-09-19T15:00:00Z http://paleopolis.rediris.es/cg/CG2006_A03/ carnetsdegeologie@hotmail.com

Teyssèdre, Bernard.- In his book, Life on a young planet, A.H. Knoll states that the first documented fossils of green algae date back 750 Ma. However, according to B. Teyssèdre's book, La vie invisible, they are much older. Using a method which combines paleontology and molecular phylogeny, this paper is an inquiry into the Precambrian fossils of some "acritarchs" and of a primitive clade of green algae, the Pyramimonadales. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_A03 Handle-ID: http://hdl.handle.net/2042/5836

2006-09-08T15:00:00Z 2006-09-08T15:00:00Z 2006-09-08T15:00:00Z http://paleopolis.rediris.es/cg/CG2006_M02/ carnetsdegeologie@hotmail.com

Hottinger, Lukas.- An illustrated glossary of terms used in the analysis of the shells of recent and fossil foraminifera supplemented by a rigorous selection of terms that facilitate an understanding of their biology and their use in ecology and biostratigraphy. The glossary includes some 650 entries illustrated by 83 - often composite - figures many of which are stereographs or 3D models. A taxonomic index lists the 140 taxa illustrated. SRef-ID: http://overview.sref.org/1634-0744/CG2006_M02 Handle-ID: http://hdl.handle.net/2042/5832

2006-09-04T15:00:00Z 2006-09-04T15:00:00Z 2006-09-04T15:00:00Z http://paleopolis.rediris.es/cg/CG2006_BOOK_02/ carnetsdegeologie@hotmail.com

Berger, Sigrid.- Dasycladales, from whichever point of view they are observed, biological or paleontological, never lack in surprises for their elegant structural simplicity is associated with an extraordinary morphological plasticity. This is why their study is so exciting and compelling for those who have a regard for these algae. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_B02 Handle-ID: http://hdl.handle.net/2042/5831

2006-05-11T16:00:00+01:00 2006-05-11T16:00:00+01:00 2006-05-11T16:00:00+01:00 http://paleopolis.rediris.es/cg/CG2006_M01/ carnetsdegeologie@hotmail.com

Ropolo, Pierre; Moullade, Michel; Gonnet, Roland; Conte, Gabriel; Tronchetti, Guy.- One of the significant results of the multidisciplinary investigations carried out during recent years in the Lower Aptian historical stratotype of the Cassis-La Bédoule region (South-Eastern France) was a proposal to update the local Upper Barremian/Lower Aptian ammonite biozonation in order to be more consistent with the standard Mediterranean zonal subdivisions. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_M01 Handle-ID: http://hdl.handle.net/2042/4744

2006-05-11T15:00:00+01:00 2006-05-11T15:00:00+01:00 2006-05-11T15:00:00+01:00 http://paleopolis.rediris.es/cg/CG2006_L02/ carnetsdegeologie@hotmail.com

Rivera-Sylva, Héctor E.; Espinosa-Chávez, Belinda.- Ankylosaurian dinosaur osteoderms have been discovered in the southeastern part of the State of Coahuila, Mexico, in the township of General Cepeda, in the locality known as El Palmar. The osteoderms were collected from rocks that had been correlated to the Cerro del Pueblo Formation (Late Cretaceous: Campanian) of the Difunta Group. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_L02 Handle-ID: http://hdl.handle.net/2042/4741

2006-03-15T15:00:00+01:00 2006-03-15T15:00:00+01:00 2006-03-15T15:00:00+01:00 http://paleopolis.rediris.es/cg/CG2006_A02/ carnetsdegeologie@hotmail.com

>Golubic, Stjepko; Radoičić, Rajka; Seong-Joo, Lee.- Decastronema kotori was first described in 1959 as Aeolisaccus kotori Radoičić, a new species of a problematic fossil worm, Aeolisaccus Elliott. In 1975 De Castro recognized the true identity of this microbial fossil: a cyanobacterium related closely to the modern genus Scytonema. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_A02 Handle-ID: http://hdl.handle.net/2042/4674

2006-02-14T15:00:00+01:00 2006-02-14T15:00:00+01:00 2006-02-14T15:00:00+01:00 http://paleopolis.rediris.es/cg/CG2006_A01/ carnetsdegeologie@hotmail.com

>Elicki, Olaf.- The Campo Pisano Formation of southwestern Sardinia is represented by an offshore carbonate succession spanning the latest Early to late Middle Cambrian. Paleogeographically, the fauna is characteristic of western Perigondwana, and indicates faunal relations to France, Spain, and Turkey. Microfaunal paleoecology reflects drowning of an isolated carbonate platform at tropical latitudes. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_A01 Handle-ID: http://hdl.handle.net/2042/4567

2006-01-30T15:00:00+01:00 2006-01-30T15:00:00+01:00 2006-01-30T15:00:00+01:00 http://paleopolis.rediris.es/cg/CG2006_L01/ carnetsdegeologie@hotmail.com

>Moullade, Michel; Tronchetti, Guy; Balme, Christine; Kouyoumontzakis, Georges.- A stratonomic and micropaleontological analysis of the Aptian marls cropping out in the La Tuilière area near Saint-Saturnin-lès-Apt (Vaucluse, SE France), enabled us to reconstitute a continuous succession almost 120 m thick, that includes the upper terms of the Lower Aptian (Bedoulian) and the lower part of the Middle Aptian (Gargasian). (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_L01 Handle-ID: http://hdl.handle.net/2042/4564

2005-12-31T19:00:00+01:00 2005-12-31T19:00:00+01:00 2005-12-31T19:00:00+01:00 http://paleopolis.rediris.es/cg/CG2005_M02/ carnetsdegeologie@hotmail.com

Steemans, Philippe; Javaux, Emmanuelle (eds.).- A set of 14 abstracts and short papers (extended abstracts) of presentations given during a meeting organized by the NFSR Working Group, "Micropaléontologie végétale et Palynologie (MVP)", held on May 11, 2005 at the University of Liège, Belgium. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2005_M02 Handle-ID: http://hdl.handle.net/2042/4353

2005-11-25T19:00:00+01:00 2005-11-25T19:00:00+01:00 2005-11-25T19:00:00+01:00 http://paleopolis.rediris.es/cg/CG2005_A04/ carnetsdegeologie@hotmail.com

Renard, Maurice; Rafélis, Marc de; Emmanuel, Laurent; Moullade, Michel; Masse, Jean-Pierre; Kuhnt, Wolfgang; Bergen, Jim A.; Tronchetti, Guy.- Comparison of oxygen and carbon isotope and manganese evolution curves in bulk carbonate from the historical Bedoulian stratotype (Cassis-La Bédoule area, Provence, France) reveals an important geochemical event (negative δ¹³C and high Mn content) located within the D. deshayesi ammonite Zone and at the base of the R. hambrowi ammonite Subzone. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2005_A04 Handle-ID: http://hdl.handle.net/2042/3229

2005-10-06T16:00:00+01:00 2005-10-06T16:00:00+01:00 2005-10-06T16:00:00+01:00 http://paleopolis.rediris.es/cg/CG2005_A03/ carnetsdegeologie@hotmail.com

Vinn, Olev.- Abundant worm borings were found in some brachiopod shells (Clitambonites, Estlandia, Nicolella) from the Ordovician (Caradoc) oil shale in North Estonia. 9 of 21 brachiopod genera (43 %) have been bored. Excluding the size and thickness of valves, no common morphological feature discriminates the brachiopods with borings from those without them. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2005_A03 Handle-ID: http://hdl.handle.net/2042/2454

2005-09-13T16:00:00+01:00 2005-09-13T16:00:00+01:00 2005-09-13T16:00:00+01:00 http://paleopolis.rediris.es/cg/CG2005_L01/ carnetsdegeologie@hotmail.com

Buffetaut, Eric; Colleté, Claude; Dubus, Bruno; Petit, Jean-Louis.- A vertebra from the Albian of Mesnil-Saint-Père (Aube, eastern Paris Basin), previously identified as the first caudal of a sauropod dinosaur, is shown to be a dorsal vertebra of a large pliosaur. The specimen resembles vertebrae from the Albian of England and eastern France that have been referred to the pliosaur Polyptychodon, a taxon in need of revision. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2005_L01 Handle-ID: http://hdl.handle.net/2042/2380

2005-05-26T16:00:00+01:00 2005-05-26T16:00:00+01:00 2005-05-26T16:00:00+01:00 http://paleopolis.rediris.es/cg/CG2005_M01/ carnetsdegeologie@hotmail.com

Lambert, Bernard; Laporte-Galaa, Cécile.- Thirteen time-stratigraphic associations of the nannofossil Discoaster have been defined and used in the Miocene Kutei Basin of eastern Borneo to establish a regional stratigraphic framework. The methodology used is discussed and the fossils employed are figured and annotated. Their aid in resolving the timing, stages and details of delta construction is presented graphically. SRef-ID: http://overview.sref.org/1634-0744/CG2005_M01 Handle-ID: http://hdl.handle.net/2042/1461

2005-05-04T16:00:00+01:00 2005-05-04T16:00:00+01:00 2005-05-04T16:00:00+01:00 http://paleopolis.rediris.es/cg/CG2005_A02/ carnetsdegeologie@hotmail.com

Moullade, Michel; Tronchetti, Guy; Bellier, Jean-Pierre.- This paper presents a thorough analysis of foraminiferal assemblages ranging in age from the Bedoulian-Gargasian transition to the middle Gargasian in the Cassis-La Bédoule area (SE France), the historical stratotype of the Lower Aptian substage. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2005_A02 Handle-ID: http://hdl.handle.net/2042/1460

2005-01-13T16:00:00+01:00 2005-01-13T16:00:00+01:00 2005-01-13T16:00:00+01:00 http://paleopolis.rediris.es/cg/CG2005_A01/ carnetsdegeologie@hotmail.com

Plaziat, Jean-Claude; Younis, Woujdan R.- The Quaternary, mainly freshwater sediments of the Lower Mesopotamian plain include a thin transgressive marine unit which extends inland some 250 km from the present coastline, the Hammar Formation. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2005_A01 Handle-ID: http://hdl.handle.net/2042/1453

2004-12-03T16:00:00+01:00 2004-12-03T16:00:00+01:00 2004-12-03T16:00:00+01:00 http://paleopolis.rediris.es/cg/CG2004_A02/ carnetsdegeologie@hotmail.com

Odin, Gilles Serge; Gardin, Silvia; Robaszynski, Francis; Thierry, Jacques.- This paper examines four facets of stratigraphic terminology and usage considered faulty and proposes corrective measures. The four perfectible areas are (...) SRef-ID: http://overview.sref.org/1634-0744/CG2004_A02 Handle-ID: http://hdl.handle.net/2042/290

2004-11-25T18:00:00+01:00 2004-11-25T18:00:00+01:00 2004-11-25T18:00:00+01:00 http://paleopolis.rediris.es/cg/CG2004_L05/ carnetsdegeologie@hotmail.com

Athanassiou, Athanassios.- This paper reports the discovery of an incomplete proboscidean mandible near the village of Maroniá in eastern Crete. The fragment described here includes the first molar (m1) of a deinothere, (...) SRef-ID: http://overview.sref.org/1634-0744/CG2004_L05 Handle-ID: http://hdl.handle.net/2042/311

2004-10-28T18:00:00+01:00 2004-10-28T18:00:00+01:00 2004-10-28T18:00:00+01:00 http://paleopolis.rediris.es/cg/CG2004_L04/ carnetsdegeologie@hotmail.com

Zhang, Zhi-Fei; Shu, De-Gan; Han, Jian; Liu, Jian-Ni.- A succession of developmental types in the lophophores of lingulid brachiopods is reported from the Early Cambrian Chengjiang deposits of South China. These types range from trocholophe, schizolophe to simple coiled spirolophe. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2004_L04 Handle-ID: http://hdl.handle.net/2042/310

2004-06-20T23:00:00+01:00 2004-06-20T23:00:00+01:00 2004-06-20T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2004_L03/ carnetsdegeologie@hotmail.com

Brehm, Ulrike; Palinska, Katarzyna A.; Krumbein, Wolfgang E.- The in vitro production of ooid-like structures as possible precursors of oolites has been observed in laboratory cultures of spherical microbial communities isolated from the Wadden Sea (North Sea) (...) SRef-ID: http://overview.sref.org/1634-0744/CG2004_L03 Handle-ID: http://hdl.handle.net/2042/309

2004-04-12T23:00:00+01:00 2004-04-12T23:00:00+01:00 2004-04-12T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2004_A01_CCE-PG/ carnetsdegeologie@hotmail.com

Emig, Christian C.; Geistdoerfer, Patrick.- The deep-water fauna of the Mediterranean is characterized by an absence of distinctive characteristics and by a relative impoverishment. Both are a result of events after the Messinian salinity crisis (Late Miocene) (...) SRef-ID: http://overview.sref.org/1634-0744/CG2004_A01 Handle-ID: http://hdl.handle.net/2042/3230

2004-03-21T23:00:00+01:00 2004-03-21T23:00:00+01:00 2004-03-21T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2004_L02_MM_etal/ carnetsdegeologie@hotmail.com

Moullade, Michel; Tronchetti, Guy; Kuhnt, Wolfgang; Renard, Maurice, Bellier, Jean-Pierre.- In the middle of the last century Gargasian strata overlying the historical stratotypic beds of the lower substage of the Aptian (Bedoulian) were still well exposed in a number of quarries that extended in a NNE-SSW trending belt from the village of Roquefort-la Bédoule to the vicinity of the Cassis railway station (...) SRef-ID: http://overview.sref.org/1634-0744/CG2004_L02 Handle-ID: http://hdl.handle.net/2042/307

2004-03-15T23:00:00+01:00 2004-03-15T23:00:00+01:00 2004-03-15T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2004_L01_MM-GT/ carnetsdegeologie@hotmail.com

Moullade, Michel; Tronchetti, Guy.- In 1998 a double volume of the Journal "Géologie Méditerranéenne" (t. XXV, N° 3-4) was devoted to a detailed inventory of the Lower Aptian (Bedoulian substage) historical stratotype located in the vicinity of Cassis and Roquefort-La Bédoule, near Marseille (Bouches-du-Rhône, SE France) (...) SRef-ID: http://overview.sref.org/1634-0744/CG2004_L01 Handle-ID: http://hdl.handle.net/2042/306

2003-12-04T23:00:00+01:00 2003-12-04T23:00:00+01:00 2003-12-04T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_L03_JCD/ carnetsdegeologie@hotmail.com

Deelmann, John C.- In recent laboratory experiments magnesite (MgCO3) has been synthesized at a temperature of 313°K (= 40°C). The experiments have demonstrated that irreversible reactions are involved in the low-temperature formation of magnesite. Fundamental to such irreversible reactions is a requirement for fluctuations, i.e., alternations between precipitation and dissolution. But unequivocal evidence for the necessity for fluctuations in order to produce such irreversible geochemical reactions can be demonstrated only by static control experiments. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_L03 Handle-ID: http://hdl.handle.net/2042/305

2003-11-22T23:00:00+01:00 2003-11-22T23:00:00+01:00 2003-11-22T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A07_SR/ carnetsdegeologie@hotmail.com

Radzevičius, Sigitas.- In recent laboratory experiments magnesite (MgCO3) has been synthesized at a temperature of 313°K (= 40°C). Two new forms of Pristiograptus dubius, here designated as varieties "A" and "B", are described and figured. Both were found in core samples representing the perneri through lundgreni biozones of the Wenlock epoch. The cores are from boreholes Šiupyliai-69, Parovėja-9, Likėnai-396, Paežeriai-222 and Sutkai-87 in central and northern Lithuania. The associated graptolites Cyrtograptus perneri Bouček, C. radians Törnquist, C. lundgreni Tullberg, Monograptus flemingii flemingii (Salter), M. testis testis (Barrande), Monoclimacis flumendosae (Gortani) and Pristiograptus pseudodubius (Bouček) (= P. parvus) are all indicative of the perneri, radians and lundgreni biozones of the Wenlock. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A07 Handle-ID: http://hdl.handle.net/2042/300

2003-10-04T23:00:00+01:00 2003-10-04T23:00:00+01:00 2003-10-04T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A06R/ carnetsdegeologie@hotmail.com

Emig, Christian C.- Since early in the 19th Century the taxonomy of fossil obolids has been the subject of numerous controversies (...), so the development of new criteria for their proper differentiation is mandatory. Based on the extant species of the family Lingulidae (...) and later applied to fossil taxa (...), new morpho-anatomical characters were established and their variability analysed. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A06R Handle-ID: http://hdl.handle.net/2042/299

2003-09-12T23:00:00+01:00 2003-09-12T23:00:00+01:00 2003-09-12T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A06_LEP-LEH/ carnetsdegeologie@hotmail.com

Popov, Leonid E.; Holmer, Lars E.- Emig (...) re-examined the taxonomy of the genus Obolus Eichwald from the Middle Cambrian - earliest Ordovician of the East Baltic region as part of a proposal for a wholesale revision of the principles of linguloid systematics. He contended that previous taxonomic studies on Obolus and related forms were carried out erroneously using characters that have no taxonomic value. Emig's proposed revision is based mainly on the limited morphological diversity between fossil and Recent taxa within a single linguloid Family, the Lingulidae. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A06 Handle-ID: http://hdl.handle.net/2042/298

2003-07-31T23:00:00+01:00 2003-07-31T23:00:00+01:00 2003-07-31T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A05_BG_etal/ carnetsdegeologie@hotmail.com

Granier, Bruno; Al Suwaidi, Ahmed Saqer; Busnardo, Robert; Aziz, Sabah K.; Schroeder, Rolf.- An integrated case study of field "A" in offshore Abu Dhabi found that the stratigraphic framework for the uppermost part of the so-called "Thamama Group" required revision. Detailed sedimentological work permitted a subdivision of the succession into lithostratigraphic units (more accurately "allostratigraphic units") and the fossil content permitted their allocation to standard age-related units ranging from Late Barremian through Middle Aptian times. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A05 Handle-ID: http://hdl.handle.net/2042/297

2003-07-12T23:00:00+01:00 2003-07-12T23:00:00+01:00 2003-07-12T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A04_BG/ carnetsdegeologie@hotmail.com

Granier, Bruno.- In carbonate reservoirs, the relationship between porosity Ø, a measure of the combined volumes of several kinds of pore space (e.g. interparticle and separate-vug), and permeability K are neither linear nor logarithmic, hence only weakly correlatable. Approaches to an estimation of permeability that employ both petrographical and petrophysical parameters, the so-called rock-typing techniques, have proven to be the most nearly precise. However in many studies simple K/Ø cross-plots are used for each rock-type to provide trendlines from which K values are derived as a function of Ø values; this is common practice even though the coefficient of correlation r² departs significantly from 1. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A04 Handle-ID: http://hdl.handle.net/2042/296

2003-07-03T23:00:00+01:00 2003-07-03T23:00:00+01:00 2003-07-03T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_L02_JMH/ carnetsdegeologie@hotmail.com

Hancock, Jake M.- It has been known since the 1970's that the relatively high sea levels during the Cenomanian in southern England and northern France were interrupted by a strong fall in sea level early in the Middle Cenomanian. This was a eustatic trough whose effects can be found not only in north-west Europe, but also from western Kazakhstan in central Asia to Texas, Colorado and South Dakota in the U.S.A. SRef-ID: http://overview.sref.org/1634-0744/CG2003_L02 Handle-ID: http://hdl.handle.net/2042/304

2003-05-01T23:00:00+01:00 2003-05-01T23:00:00+01:00 2003-05-01T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_L01_CCE/ carnetsdegeologie@hotmail.com

Emig, Christian C.- Lingula is often considered a "living-fossil" based on its supposed lengthy morphological conservatism owing to its absence of evolution, and its remarkable survival for more than 550 M.Y. This conclusion is based on the typical apparently unchanged "linguliform" shape of the shell. However the taxa of the family Lingulidae show morphological evolutionary changes despite the fact that the group appears panchronic among the Recent Brachiopoda. Consequently, traditional opinion that Lingula is a "living-fossil" should be rejected. Diagnoses of the Family Lingulidae and of its three genera are herewith emended. SRef-ID: http://overview.sref.org/1634-0744/CG2003_L01 Handle-ID: http://hdl.handle.net/2042/303

2003-04-26T23:00:00+01:00 2003-04-26T23:00:00+01:00 2003-04-26T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A03_KAT/ carnetsdegeologie@hotmail.com

Tröger, Karl-Armin.- In Central Europe one of the most important interchanges between the North Temperate Realm and the Tethyan Realm took place during the Cenomanian along the course of the Elbe Valley Geosuture that separates the Erzgebirge block (part of the Mid European Island during the Cretaceous) from the Lusatian block (West Sudetic Island). Strata of the Lower Cretaceous and the basal portion of Lower Cenomanian are absent in the Elbe Valley Geosuture but a marine transgression in a NW-SE direction occupied a portion of this tract during the late Early Cenomanian and a second incursion from SE to NW occurred during the Late Cenomanian. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A03 Handle-ID: http://hdl.handle.net/2042/295

2003-03-08T23:00:00+01:00 2003-03-08T23:00:00+01:00 2003-03-08T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A02_BL/ carnetsdegeologie@hotmail.com

Lambert, Bernard.- The Mahakam delta is a mixed, fluvial and wave dominated delta located in the eastern part of the island of Borneo (the East Kalimantan province of Indonesia). The distribution of benthic fauna in this delta system is influenced by the combined or antagonistic action of three main parameters: fluvial input of fresh water and sediment, tide, and a strong regional north to south drift current. A model of the present-day faunal distribution has been established taking into account the perturbations induced by the tide and by the regional drift current. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A02 Handle-ID: http://hdl.handle.net/2042/294

2003-02-17T23:00:00+01:00 2003-02-17T23:00:00+01:00 2003-02-17T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2003_A01_JCR-FE/index_uk.html carnetsdegeologie@hotmail.com

Rage, Jean-Claude; Escuillié, François.- Three "snakes with legs" are known: Pachyrhachis problematicus, Haasiophis terrasanctus and Eupodophis descouensi. They have short posterior limbs but lack an anterior girdle and forelimbs. Moreover, Pachyophis woodwardi, Mesophis nopcsai and Simoliophis ssp. appear to be closely related to the hindlimbed taxa; consequently, although the presence of posterior limbs has not been demonstrated for these genera, it is presumed that they too were hindlimbed. All these snakes have been recovered only from the Cenomanian. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2003_A01 Handle-ID: http://hdl.handle.net/2042/293

2002-11-27T23:00:00+01:00 2002-11-27T23:00:00+01:00 2002-11-27T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2002_A01_CCE/ carnetsdegeologie@hotmail.com

Emig, Christian C.- This study points out some basic problems of linguloid systematics and proposes solutions for them. A taxonomic examination of the unique species of the genus Obolus found in the Upper Cambrian of Estonia and Russia, O. apollinis (= O. ruchini, O. transversus, O. rebrovi and Ungula convexa) is used as an example of a methodology employing all of the characters valid for distinguishing species of both extant and fossil Lingulidae. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2002_A01 Handle-ID: http://hdl.handle.net/2042/301

2002-10-14T23:00:00+01:00 2002-10-14T23:00:00+01:00 2002-10-14T23:00:00+01:00 http://paleopolis.rediris.es/cg/CG2002_M01_SSV-FR-MR/index_uk.html carnetsdegeologie@hotmail.com

Servant-Vildary, Simone ; Risacher, François; Roux, Maurice.- Diatom assemblages and water chemistry were studied in 13 shallow salt lakes in the southern part of the Bolivian Altiplano. At each locality bottom sediment and water samples were collected simultaneously. Relationships between the composition of the diatom assemblages and variations in water chemistry were collated in order to permit the estimation of ancient water chemistries based on changes in the make up of fossil diatom associations in older sediments. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2002_M01 Handle-ID: http://hdl.handle.net/2042/4566