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/ 2009-09-30T19:17:37Z http://paleopolis.rediris.es/cg/ http://paleopolis.rediris.es/cg/carnetsdegeologie.gif text/html 2009-09-30T19:17:37Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_A07/ Bruno R.C. Granier & Christian Staffelbach.- 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 text/html 2009-09-30T19:14:10Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_A06/ Lukas Hottinger.- 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 text/html 2009-09-17T19:01:06Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_B03/ Jere H. Lipps (ed.) & Bruno R.C. Granier (ed.).-<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 text/html 2009-09-15T12:47:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_A05/ Philippe Quereilhac, Didier Marchand, Rémi Jardat, Alain Bonnot, Dominique Fortwengler & Philippe Courville.- 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 text/html 2009-09-15T12:42:35Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_M02/ Philippe Quereilhac.- 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 text/html 2009-08-01T16:54:04Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_L03/ Eric Buffetaut.- 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 text/html 2009-08-01T16:51:36Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_L02/ Héctor E. Rivera-Sylva, Eberhard Frey & José Rubén Guzmán-Gutiérrez.- 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 text/html 2009-05-18T13:21:15Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_A04/ Bruno R.C. Granier, Monique Feist, Edward Hennessey, Ioan I. Bucur & Baba Senowbari-Daryan.- 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 text/html 2009-04-22T14:19:49Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_A03/ Robert W. Scott.- 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 text/html 2009-04-04T19:33:53Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_A02/ Didier Bert & Gérard Delanoy.- 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 text/html 2009-04-04T19:31:24Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_A01/ Jean-François Babinot, Jean-Paul Colin & Auran Randrianasolo.- 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 text/html 2009-03-31T19:27:37Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_L01/ Margarita Simeoni.- 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 text/html 2009-03-31T19:24:59Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_M01/ Nico M.M. Janssen.- 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 text/html 2009-01-20T13:24:39Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2009_SP01/ Patrick Génot.- 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 text/html 2008-12-10T14:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A09/ Elizabeth A. Stephens, Olivier Braissant & Pieter T. Visscher.- 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 text/html 2008-12-10T14:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A08/ Christian C. Emig.- 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 text/html 2008-09-28T14:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_M04/ Bernard Joly & Michel Delamette.- 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 text/html 2008-09-28T14:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A07/ Bruno Granier.- 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 text/html 2008-09-07T14:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_BOOK_01/ Emanuela Mattioli, Silvia Gardin, Fabienne Giraud, Davide Olivero, Bernard Pittet & Stéphane Reboulet.- 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 text/html 2008-08-27T00:00:01Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_L03/ Pierre Ropolo, Michel Moullade, Gabriel Conte & Guy Tronchetti.- 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 text/html 2008-08-27T00:00:02Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_M03/ Pierre Ropolo, Gabriel Conte, Michel Moullade, Guy Tronchetti & Roland Gonnet.- 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 text/html 2008-08-01T08:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A06/ Hamid Haddoumi, André Charrière, Bernard Andreu & Pierre-Olivier Mojon.- 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 text/html 2008-05-17T12:00:02Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_L02/ 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 text/html 2008-05-17T12:00:01Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_L02/index-fr.html 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 Handle-ID: http://hdl.handle.net/2042/17065 text/html 2008-05-17T11:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_M02/" 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 text/html 2008-04-17T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A05/ 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 text/html 2008-03-22T15:00:01Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_M01/ 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 text/html 2008-03-22T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A04/ 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 text/html 2008-03-20T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A03/ 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 text/html 2008-02-04T15:00:02Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_L01/ 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 text/html 2008-02-04T15:01:01Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A02/ 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 text/html 2008-02-04T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A02/index-fr.html 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 text/html 2008-01-28T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2008_A01/ 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 text/html 2007-11-01T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_A07/ 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 text/html 2007-09-25T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_A06/ 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 text/html 2007-07-25T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_A05/ 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 text/html 2007-07-02T16:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_A04/ 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 text/html 2007-07-02T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_A03/ 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 text/html 2007-05-24T15:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_A02/ 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 text/html 2007-05-15T19:00:00Z http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_M02/ 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 text/html 2007-04-04T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_L01/ Silva, Hilda Maria Andrade da; Gallo, Valéria.- Parsimony analysis of endemicity was applied to analyze the distribution of enchodontoid fishes occurring strictly in the Cenomanian. The analysis was carried out using the computer program PAUP* 4.0b10, based on a data matrix built with 17 taxa and 12 areas. The rooting was made on an hypothetical all-zero outgroup. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2007_L01 Handle-ID: http://hdl.handle.net/2042/7146 text/html 2007-03-22T19:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_M01/ 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 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 text/html 2007-02-27T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2007_A01/ 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 text/html 2006-12-14T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_A05/ 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/2042/6697 text/html 2006-09-26T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_BOOK_01/ 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 text/html 2006-09-21T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_A04/ 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 text/html 2006-09-19T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_A03/ 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 text/html 2006-09-08T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_M02/ 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 text/html 2006-09-04T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_BOOK_02/ 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 text/html 2006-05-11T16:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_M01/ 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 text/html 2006-05-11T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_L02/ 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. (...) SRef-ID: http://overview.sref.org/1634-0744/CG2006_L02 Handle-ID: http://hdl.handle.net/2042/4741 text/html 2006-03-15T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_A02/ 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 text/html 2006-02-14T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_A01/ 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 text/html 2006-01-30T15:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2006_L01/ 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 text/html 2005-12-31T19:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2005_M02/ 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 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 text/html 2005-11-25T19:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2005_A04/ 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 text/html 2005-10-06T16:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2005_A03/ 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 text/html 2005-09-13T16:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2005_L01/ 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 text/html 2005-05-26T16:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2005_M01/ 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 text/html 2005-05-04T16:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2005_A02/ 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 text/html 2005-01-13T16:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2005_A01/ 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 text/html 2004-12-03T16:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2004_A02/ 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 text/html 2004-11-25T18:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2004_L05/ 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 text/html 2004-10-28T18:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2004_L04/ 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 text/html 2004-06-20T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2004_L03/ 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 text/html 2004-04-12T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2004_A01_CCE-PG/ 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 text/html 2004-03-21T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2004_L02_MM_etal/ 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 text/html 2004-03-15T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2004_L01_MM-GT/ 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 text/html 2003-12-04T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_L03_JCD/ 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 text/html 2003-11-22T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A07_SR/ 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 text/html 2003-10-04T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A06R/ 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 text/html 2003-09-12T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A06_LEP-LEH/ 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 text/html 2003-07-31T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A05_BG_etal/ 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 text/html 2003-07-12T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A04_BG/ 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 text/html 2003-07-03T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_L02_JMH/ 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 text/html 2003-05-01T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_L01_CCE/ 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 text/html 2003-04-26T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A03_KAT/ 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 text/html 2003-03-08T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A02_BL/ 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 text/html 2003-02-17T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2003_A01_JCR-FE/index_uk.html 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 text/html 2002-11-27T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2002_A01_CCE/ 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 text/html 2002-10-14T23:00:00+01:00 http://paleopolis.rediris.es/cg/ carnetsdegeologie@hotmail.com http://paleopolis.rediris.es/cg/CG2002_M01_SSV-FR-MR/index_uk.html 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