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2021 (vol. 21)
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A possible crawling paracomatulid crinoid from the Lower Jurassic of central Italy
Riccardo MANNI & Rolando DI NARDO
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| DOI: 10.2110/carnets.2021.2119
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Abstract: A new paracomatulid crinoid, Tiburtocrinus
toarcensis gen. et sp. nov., is described from the Lower Jurassic of Tivoli
(central Apennines, Italy). This type of stemless crinoids has never previously
been recorded in Italy, and this report bridges a significant gap.
Morphofunctional analysis of the radial facets suggests that Tiburtocrinus
toarcensis gen. et sp. nov. may have been a crawling paracomatulid, very
different from other paracomatulids that probably swam.
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Carnets Geol., vol. 21, no. 19, p. 523-532
Online since December 25, 2021
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Nomenclatural Note, p.
234
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Biostratigraphic distribution of orbitolinids in the ammonite biozones (Urgonian platform of southeastern France). Part 2: Barremian p.p.
Bruno GRANIER, Bernard CLAVEL, Robert BUSNARDO, Jean CHAROLLAIS, Pierre DESJACQUES & Didier BERT
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| DOI: 10.2110/carnets.2021.2118
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Abstract:
The biostratigraphic distribution of orbitolinids for the Barremian of SE France proposed hereafter is calibrated on the ammonite
biozonation. This work is based on the study of eleven sections with orbitolinids associated to macrofossils (ammonites and/or
echinids) significant in terms of biostratigraphy or overlain with levels bearing the above macrofossils.
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Carnets Geol., vol. 21, no. 18, p. 399-521
Online since October 24, 2021
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The ichnospecies Linichnus bromleyi on a Miocene baleen whale radius preserving multiple shark bite-shake traces suggests scavenging
Stephen J. GODFREY & Annie J. LOWRY
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| DOI: 10.2110/carnets.2021.2117
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Abstract: An isolated Miocene baleen whale left radius was marked repeatedly by
shark bite-shake traces. The radius probably derives from the Plum Point Member
of the Calvert Formation, Calvert Cliffs, Calvert County, Maryland, U.S.A. At
least three successive bite-shake traces marking the
radius, made by multiple teeth, are attributed to the trace fossil Linichnus
bromleyi. These bite-shake traces
consisting of shallow, thin arching gouges on a radius, likely indicate
scavenging rather than active predation. The most likely means of producing the
bundle of L. bromleyi within each of
the three sets of traces would be through repeated biting as the shark
re-positioned the prey in its mouth or, perhaps, by a shark species with
multiple functional teeth within its tooth row. If the bite traces were
produced by a non-serrated tooth (as they appear to have been), then the most
likely candidate would be Carcharodon hastalis.
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Carnets Geol., vol. 21, no. 17, p. 391-398
Online since October 24, 2021
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Corrigendum, p.
202: An error was made in the spelling of the family name of one of the artists who created Figure 2. The correct spelling of his family name is "Schumaker".
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New genera and species of ostracods from the El Ma El Abiod Miocene Basin (Tébessa, NE Algeria)
Francesco SCIUTO & Abdelhakim BENKHEDDA
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| DOI: 10.2110/carnets.2021.2116
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Abstract: Two new ostracod genera
of the family Trachyleberididae Sylvester-Bradley, 1948,
each based on a new species, are described and commented here. The specimens were collected in Tortonian
sediments cropping out at El Hadjra Safra in the El Ma El Abiod basin (region of
Tébessa, north-eastern Algeria).
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Carnets Geol., vol. 21, no. 16, p. 383-390
Online since October 24, 2021
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Nomenclatural Note, p.
180
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The late Berriasian early evolutionary burst of the Orbitolinidae: New insights into taxonomy, origin, diversification and phylogeny of the family based on data from eastern Serbia
Felix SCHLAGINTWEIT & Ioan I. BUCUR
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| DOI: 10.2110/carnets.2021.2115
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Abstract: New data from the Carpatho-Balkanides of eastern Serbia evidence the more or less
near-simultaneous "explosive" first appearances of several genera of the
Orbitolinidae in the late Berriasian. Most of the observed taxa were previously
recorded from strata not older than the Late Hauterivian (= classical Urgonian
of southeastern France), evidence that these ages refer to local
first appearance data. The diversified assemblage from Serbia includes
representatives of the subfamilies Dictyoconinae: genera Cribellopsis
Arnaud-Vanneau, Montseciella
Cherchi & Schroeder, Orbitolinopsis
Henson, Urgonina Foury
& Moullade, Valserina Schroeder
& Conrad, Vanneauina Schlagintweit,
and Dictyorbitolininae: genus Paracoskinolina
Moullade. Representatives of the Orbitolininae (with complex embryo) have
not been observed. They appeared later in the fossil record seemingly during the
Late Hauterivian-early Barremian. All together 17 taxa are reported, of which three in open nomenclature. A new species is described as Cribellopsis
sudari n. sp. The majority of the observed species display medium- to
high-conical tests and a rather simple exoskeleton lacking horizontal partitions
(rafters). The new data contradict a phylogenetic evolution of distinct genera
displaying different internal test structures one after the other in time (=
ancestor-descendant relationships) as postulated by some authors. The
explosive radiation ("early burst") of the Orbitolinidae in the late Berriasian is accompanied by the first appearance date of several other large
benthic foraminifera including mostly agglutinating (e.g.,
Ammocycloloculina, Choffatella, Drevennia, Eclusia,
Moulladella, Pfenderina,
Pseudotextulariella) but also complex porcelaneous taxa (Pavlovcevina)
providing evidence for a bioevent in this time period that exceeds the number of
taxa originating in the previous (Tithonian) and the following stage (Valanginian).
The early evolutionary history of the Orbitolinidae can be considered a
classical example of adaptive radiation within the clade's history.
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Carnets Geol., vol. 21, no. 15, p. 343-382
Online since August 17, 2021
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Nomenclatural Note, p.
136
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Rudist bivalves (Hippuritoidea) from the Clifton Limestone (Lower Campanian) of western Jamaica and a reassessment of the genus Vaccinites in the Americas
Simon F. MITCHELL
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| DOI: 10.2110/carnets.2021.2114
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Abstract: The lower Campanian (Upper Cretaceous) Clifton Limestone of Jamaica yields three
species of hippuritid bivalve: Barrettia
ruseae Chubb, Whitfieldiella luceae sp. nov. and Vaccinites vermunti Mac Gillavry,
and the plagioptychid: Plagioptychus
sp. The hippuritids are described in detail using statistics. Barrettia
ruseae is demonstrated to be a more primitive species of Barrettia
than B. monilifera Woodward
or B. multilirata Whitfield,
and the species Whitfieldiella luceae
is shown to be a more primitive species of Whitfieldiella
than W. gigas Chubb.
The specimens of Vaccinites from the
Clifton Limestone are compared with populations of Vaccinites from elsewhere in the Americas, and five species (probably
representing a single evolutionary lineage) are recognized: V.
alencasteri sp. nov. (?late Turonian-?Coniacian), V.
martini Mac Gillavry (probably early
to mid Santonian), V. macgillavryi Palmer
(probably mid to late Santonian), V.
vermunti Mac Gillavry (earliest
Campanian), and V. temazcali sp. nov. (late early Campanian). The Vaccinites
species can be distinguished using statistical techniques. The ages of the
Clifton Limestone and the five Vaccinites
species are reviewed. This research demonstrates the value of using hippuritids
for biostratigraphy in the Upper Cretaceous of the Americas.
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Carnets Geol., vol. 21, no. 14, p. 315-341
Online since July 7, 2021
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Nomenclatural Note, p. 342
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Kimmeridgian and early Tithonian cephalopods from the Kisújbánya Limestone Formation, Zengővárkony (Mecsek Mountains, southern Hungary), their faunal composition, palaeobiogeographic affinities, and taphonomic character
László BUJTOR, Richárd ALBRECHT, Csaba FARKAS, Bertalan MAKÓ, Dávid MARÓTI & Ákos MIKLÓSY
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| DOI: 10.2110/carnets.2021.2113
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Abstract: A new collection at Zengővárkony
(Mecsek Mountains, Hungary) provided a rich and diverse but poorly preserved cephalopod-dominated fossil assemblage representing the Kimmeridgian and the lower Tithonian. The material
came from mixed scree, soil, and amongst roots affected by weathering processes having been exposed to the elements for a long time. The nautiloid Pseudaganides strambergensis
is the first record from the Mecsek Mountains. Due to the weathering, the ammonite fauna consists of mainly fragmentary and dissolved individuals that comprises 528 specimens belonging
to 34 species and 30 genera out of which 20 species and 15 genera are reported for the first time from the Mecsek Mountains. The fauna includes specimens of known taxa. No new taxa are
introduced. Based on the comparison with other faunas, this assemblage most closely resembles the fauna of the Venetian Alps (Italy). Additional faunal elements include aptychi
(Laevaptychus latus, Lamellaptychus murocostatus), belemnites (Hibolithes semisulcatus), and an indetermined brachiopod. The first record of Spiraserpula spirolinites,
an encrusting fossil polychaete preserved on the internal mould of a Taramelliceras shell fragment indicates favourable bottom conditions for the epifauna. The presence of
Aspidoceras caletanum, Gravesia aff. gigas, and Pseudowaagenia inerme indicates faunal connections with the Submediterranean Province of the Tethys, which is
in line with the tectonic and palaeogeographical position of the Mecsek Zone during the Late Jurassic. The ammonite assemblage represents elements of five Tethysian ammonite zones of the
Kimmeridgian and Tithonian. The lower Kimmeridgian Herbichi Zone is indicated by Streblites tenuilobatus and Praesimoceras herbichi. The upper Kimmeridgian Acanthicum Zone
is indicated by Aspidoceras acanthicum, and the Cavouri Zone by Mesosimoceras cavouri and Aspidoceras caletanum. The upper Kimmeridgian Beckeri Zone is suggested by
Hybonoticeras pressulum and Pseudowaagenia inerme. Whereas Gravesia aff. gigas, Lithacoceras aff. siliceum, and Malagasites? denseplicatus
are faunal elements characterising the Early Tithonian Hybonotum Zone. Phylloceratid and lytoceratid specimens account only for 12% of the fauna, while the majority of the specimens belong
to the Oppeliidae and Ataxioceratidae (60%).
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Carnets Geol., vol. 21, no. 13, p. 265-314
Online since July 4, 2021
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The Cretaceous nautiloid genus Anglonautilus Spath, 1927, in France
Cyril BAUDOUIN, Gérard DELANOY, Jens LEHMANN, Camille FRAU, Roland GONNET & Jean VERMEULEN
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| DOI: 10.2110/carnets.2021.2112
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Abstract: The occurrence of the nautiloid genus Anglonautilus Spath
in France was limited to the report of Anglonautilus
dorsoplicatus (Wiedmann)
from the Albian of Escragnolles (Alpes-Maritimes) and Anglonautilus sp. from the Aptian of Les Ferres (Alpes-Maritimes).
Here we document the presence of the successive species Anglonautilus
praeundulatus Lehmann et al., Anglonautilus
undulatus (Sowerby) and Anglonautilus
dorsoplicatus (Wiedmann) from the Cretaceous of France. The
stratigraphic range of Anglonautilus
Spath, hitherto unknown before Aptian times is extended downward
to the Hauterivian. The Hauterivian species Nautilus
begudensis Kilian & Reboul, sometimes assigned to the genus Anglonautilus
Spath, is revised and re-assigned to the genus Cymatoceras
Hyatt.
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Carnets Geol., vol. 21, no. 12, p. 235-263
Online since June 24, 2021
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New insights into the depositional environment and stratigraphic position of the Gugu Breccia (Pădurea Craiului Mountains, Romania)
Traian SUCIU, George PLEŞ, Tudor TĂMAŞ, Ioan I. BUCUR, Emanoil SĂSĂRAN & Ioan COCIUBA
| HTML
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| DOI: 10.2110/carnets.2021.2111
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Abstract: The study of the carbonate clasts
and matrix of a problematic sedimentary formation (the Gugu Breccia) from the Pădurea
Craiului Mountains reveals new information concerning its depositional
environment and stratigraphic position. The identified microfacies and
micropaleontological assemblages demonstrate that all the sampled limestone
clasts from the Gugu Breccia represent remnants of a fragmented Urgonian-type carbonate platform. The Barremian age of the
clasts suggests that the stratigraphic position of the Gugu Breccia at its type
locality could be uppermost Barremian-lowermost Aptian, a fact demonstrated
also by the absence of elements from Lower Cretaceous carbonate platforms higher
in the stratigraphic column (e.g., Aptian or Albian) of the Bihor Unit. The sedimentological
observations together with the matrix mineralogy bring new
arguments for the recognition of terrigenous input during the formation of the
Gugu Breccia.
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Carnets Geol., vol. 21, no. 11, p. 215-233
Online since June 24, 2021
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Another thermophilic "Miocene survivor" from the Italian Pliocene: A geologically young occurrence of the pelagic eagle ray Aetobatus in the Euro-Mediterranean region
Alberto COLLARETA, Marco MERELLA, Simone CASATI, Giovanni COLETTI & Andrea DI CENCIO
| HTML
| PDF [669 KB]
| DOI: 10.2110/carnets.2021.2110
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Abstract: Aetobatus
(Myliobatiformes: Aetobatidae) is a living genus of eagle rays that occurs in
shallow-marine, tropical and subtropical environments of the Atlantic, Pacific,
and Indian Oceans. Nowadays, Aetobatus does not inhabit the cool- to
warm-temperate European and Mediterranean waters, though it is known from this
broad region by virtue of several fossil teeth ranging chronostratigraphically
from the lower Palaeogene to the upper Neogene. The present paper reports on a
fossil aetobatid tooth discovered in mid-Pliocene (upper Zanclean to lower
Piacenzian, 3.82-3.19 Ma) marine deposits exposed in the vicinities of Certaldo
(Tuscany, Italy) and identified as belonging to †Aetobatus cf.
cappettai. This specimen comprises the youngest occurrence of Aetobatus
along the coasts of mainland Europe; furthermore, together with previous finds
from roughly coeval deposits of Mallorca (Balearic Islands, Spain), it
represents the most recent record of this genus in the whole Euro-Mediterranean
region. In light of the environmental preferences of extant Aetobatus
spp., our discovery suggests palaeoenvironmental conditions favourable to the
persistence of tropical/subtropical taxa of "Miocene survivors" along
the Pliocene coasts of Tuscany. In addition, it raises the question of whether
or not the Messinian Salinity Crisis really resulted in the complete collapse of
the Mediterranean marine biota and in the subsequent recolonisation of the
Mediterranean Basin from the adjoining Atlantic waters and/or scattered marginal
intrabasinal refugia at the beginning of the Pliocene. The possibility of Aetobatus
recolonising the Mediterranean Sea through the Suez Canal in the near future is
discussed.
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Carnets Geol., vol. 21, no. 10, p. 203-214
Online since June 24, 2021
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The Kalkowsky Project - Chapter I. Ooid - stromatoid relationship in a stromatolite from the Maiz Gordo Fm (Argentina)
Bruno R.C. GRANIER & Philippe LAPOINTE
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| PDF [1,400 KB]
| DOI: 10.2110/carnets.2021.2109
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Abstract: The
comparative study of oolites and stromatolites demonstrates striking
similarities between Kalkowsky's German Triassic material (drawn from the
scientific literature) and our Argentinian Paleogene material. However, the
latter better illustrates that ooids and stromatoids, hence oolites and
stromatolites, which share the same dual (i.e., organic and mineral)
nature, are merely the end-members of a continuum of microbial carbonate
structures.
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Carnets Geol., vol. 21, no. 9, p. 193-201
Online since June 14, 2021
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Messinian ostracodes from the western Betic Strait (SW Spain)
Verónica ROMERO, Francisco RUIZ, María Luz GONZÁLEZ-REGALADO, Josep TOSQUELLA, Manuel ABAD, Tatiana IZQUIERDO, Antonio TOSCANO & Paula GÓMEZ
| HTML
| PDF [620 KB]
| DOI: 10.2110/carnets.2021.2108
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Abstract: During the Neogene, the Betic Strait was one of the gateways that connected the Atlantic Ocean and the Mediterranean Sea. In this paper, we have analyzed the ostracod faunas of samples collected from sediments crossed by a long borehole in southwestern Spain. These sediments were deposited in the Betic strait just before the Messinian Salinity Crisis. During the middle Messinian (6.8-6.0 Ma), the scarce and low diversified ostracod assemblages (Krithe, Parakrithe, Henryhowella) are typical of upper bathyal palaeoenvironments (200-400 m water depth). This period includes a short transition (6.26-6.25 Ma) to outer neritic palaeoenvironments, coinciding with a glaciation and characterized by the presence of Acanthocythereis hystrix (Reuss, 1850) and the disappearance of Krithe and Parakrithe. The most abundant species have a wide biostratigraphic distribution, most of them ranging from the Tortonian until the Holocene.
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Carnets Geol., vol. 21, no. 8, p. 181-192
Online since April 1, 2021
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Jurassian brachiopods of the Valanginian - Hauterivian interval. Their contribution to the dating of the Salima Formation in Mount Lebanon
Yves ALMÉRAS, Serge FERRY, Bruno R.C. GRANIER & Yann MERRAN
| HTML
| PDF [1,734 KB]
| DOI: 10.2110/carnets.2021.2107
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Abstract: The
Jurassian French or Swiss outcrops of the lowermost Cretaceous (Valanginian or Hauterivian) yield numerous brachiopod species including
3 species: Lamellaerhynchia
desori (Loriol in Pictet & Campiche,
1872), Sulcirhynchia valangiensis (Loriol, 1864), and Terebratulina
arzierensis (Loriol, 1864), which are not found in Lebanon. The fossiliferous site of the Salima Formation at
Zeghrine, a locality close to Bikfaya (Mount Lebanon), yields an assemblage made of Belothyris pseudojurensis
(Leymerie, 1842), Lamellaerhynchia
hauteriviensis Burri,
1953, Loriolithyris valdensis (Loriol, 1868), Lor. latifrons
(Pictet, 1872), Sellithyris carteroniana (Orbigny, 1847),
and Terebratulina biauriculata Orbigny, 1850; all are also present
in Jurassian localities. On the basis of the study
of its brachiopod assemblage, the Salima Formation is therefore ascribed an
undifferentiated Valanginian age.
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Carnets Geol., vol. 21, no. 7, p. 163-179
Online since March 24, 2021
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First record of late Campanian paleoceanographic and paleoclimatic changes, Arabian Platform, Mazidag-Mardin area, SE Turkey
İsmail Ömer YILMAZ, Izzet HOŞGÖR, Sevinç ÖZKAN-ALTINER, Michael WAGREICH & Jiří KVAČEK
| HTML
| PDF [1,897 KB]
| DOI: 10.2110/carnets.2021.2106
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Abstract: The
sedimentology, geochemistry and paleontology of the pelagic upper Campanian
Maastrichtian Bozova Formation in the "Mazidag" (Mazıdağı)
- Mardin area, SE Turkey, reveal
paleoceanographic and paleoecological changes for the first time. A 119.25
m-thick composite stratigraphic section is characterized by alternating marls,
clayey limestones, shales, and black shales; no coarse siliciclastic admixture
or turbidite intercalations were recorded in the section. Biostratigraphic data
indicate the presence of the Radotruncana
calcarata Zone, and the UC15de/UC16 nannofossil zones. Stable isotope and
elemental geochemical analyses have been carried out in the studied section. The
isotope curves display similar patterns compared to reference curves from
European and Chinese basins in the same interval. The prominent negative carbon
isotope excursion determined in the upper interval can be correlated with the
Late Campanian Event. Proxy elements display generally two relative rising
trends in productivity from the lower part and the middle part of the
succession. The lower part of the section records relatively more dysoxic/anoxic
conditions and coincides with common black shale beds.
The presence of both diverse planktonic foraminifera and calcareous nannofossils in
the studied interval indicates
a fully marine, warm-water, low-latitude Tethysian oceanic environment. In
addition, the plant fossils derived from the nearby land mass indicate that a
tropical humid climate was similar to that in northeast Australia. Therefore,
warm water, tropical humid atmospheric conditions developed in the studied area
causing the rise in productivity, precipitation and transportation of plant
debris into offshore environments.
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Carnets Geol., vol. 21, no. 6, p. 137-162
Online since March 24, 2021
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Bioerosion in Ostrea lamellosa shells from the Messinian of the Tafna basin (NW Algeria)
Mohammed N. NAIMI, Olev VINN & Amine CHERIF
| HTML
| PDF [1,139 KB]
| DOI: 10.2110/carnets.2021.2105
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Abstract: Bioerosional trace fossils (borings) are reported for the first time in
Algeria. Three ichnotaxa observed
in the shells of Ostrea lamellosa from the lower Messinian (upper
Miocene)
deposits of the Tafna basin (NW Algeria) are described. The ichnotaxa are Entobia
cf. geometrica, Gastrochaenolites cf. torpedo and Trypanites
isp.. Ostrea lamellosa shells are encrusted by balanid barnacles which are
bored by Trypanites isp.. The ichnoassemblage is assigned to the Trypanites
ichnofacies. Besides the bioerosion and encrustation described herein,
specimens permitted the identification of the different phases of the Messinian
transgression across the Souk el Khemis shoal.
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Carnets Geol., vol. 21, no. 5, p. 127-135
Online since February 28, 2021
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Mediterranean Neocomian belemnites, part 5: Valanginian temporal distribution and zonation (and some lithological remarks)
Nico M.M. JANSSEN
| HTML
| PDF [5,238 KB]
| DOI: 10.2110/carnets.2021.2104
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Abstract: A zonation based on the temporal distribution of belemnites is presented for the
Valanginian and its boundaries. It is calibrated on ammonite controlled and bed-by-bed
correlated sections from the pre-Vocontian Basin (southeast France). Three new sections are introduced
herein that have previously not been investigated. All
together, seven zones and six subzones are introduced. In addition, both within
the Vocontian area, as well as outside (Bulgaria, Crimea, Czech
Republic, France, Hungary, Morocco, Romania, Slovakia, Spain, Switzerland), differences regarding the spatial
distribution of belemnites are investigated. Also, in two addenda, some
remarks are given regarding lithological oddities.
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Carnets Geol., vol. 21, no. 4, p. 67-126
Online since February 28, 2021
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Revision of Ostrea (Gigantostrea) gigantica Solander var. oligoplana Sacco and Ostrea (Ostrea) isseli Rovereto (Oligocene, Tertiary Piedmont Basin, NW Italy)
Maria Cristina BONCI, Davide DAGNINO, Andrea MANDARINO, Aaron MAZZINI & Michele PIAZZA
| HTML
| PDF [1,573 KB]
| DOI: 10.2110/carnets.2021.2103
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Abstract: The aim of this paper is the revision and redocumentation
of Ostrea (Gigantostrea) gigantica Solander
var. oligoplana Sacco, 1897, Ostrea (Ostrea) isseli n. denom. Rovereto,
1897, and Ostrea
(Ostrea) isseli n. denom. var. elongata
Rovereto, 1897. These taxa are from the Oligocene
strata of the Molare Formation (Tertiary Piedmont Basin, southern Piedmont -
central Liguria, NW Italy). The syntypes of O. (G.)
gigantica var. oligoplana are in
the "Collezione Bellardi e Sacco", at the Museo
Regionale di Scienze Naturali di Torino; the syntypes of O. (O.)
isseli and O. (O.)
isseli var. elongata are in the "Collezione BTP" (BTP Collection, at the
Dipartimento di Scienze della Terra, dell'Ambiente e della Vita - DISTAV - of
the Universitŕ di Genova). The var. oligoplana is here moved to the species rank and allocated to the
genus Pycnodonte Fischer von Waldheim, 1835. O. (O.)
isseli and O. (O.)
isseli var. elongata are
recognized as junior synonyms of the Sacco's taxon. Rovereto
(1897) compared his new species with Ostrea
subgigantea Raulin & Delbos,
1855, a poorly known taxon,
that is here figured for the first time and shown to represent a species
different from P. oligoplana (Sacco, 1897).
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Carnets Geol., vol. 21, no. 3, p. 55-66
Online since February 24, 2021
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Systematic revision and evolution of the Tithonian family Chitinoidellidae Trejo, 1975
Mohamed BENZAGGAGH
| HTML
| PDF [1,884 KB]
| DOI: 10.2110/carnets.2021.2102
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Abstract: Several new genera and species of the family Chitinoidellidae Trejo,
1975, were erected
by Pop (1997, 1998a, 1998b). Some of these taxa are justified, but others are inadequately defined, and require revision. I discuss herein the non-validity of some taxa and propose a new systematic classification and an evolutionary framework for the family Chitinoidellidae, with two subfamilies:
1) Dobeninae, which include small-sized chitinoidellids, with the genera Borziella Pop,
1997, Carpathella Pop, 1998a, Daciella Pop,
1998a (amended), Dobenilla n. gen., and Popiella Reháková,
2002, and
2) Bonetinae, which includes larger-sized chitinoidellids, with the genera Bermudeziella n. gen., Bonetilla n. gen., and Furrazolaia n. gen.. These two families are separated in time. Small species of the subfamily Dobeninae characterise the Dobeni Subzone (Ponti ammonite Zone) and disappear immediately before the occurrence of the larger specimens of the subfamily Bonetinae, which characterise the Boneti Subzone (Microcanthum p.p. ammonite Zone).
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Carnets Geol., vol. 21, no. 2, p. 27-53
Online since February 15, 2021
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Nomenclatural Note, p. 54
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Apianella nom. nov. (Dasycladales, Triploporellaceae): New name for the preoccupied
algal genus Apinella Granier et al.,
1986
Bruno GRANIER & François MICHAUD
| PDF [123 KB]
| DOI: 10.2110/carnets.2021.21NN1
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Carnets Geol., vol. 21, Nomenclatural Note 1, p. 26
Online since January 21, 2021
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Bacinella, a discrete type of Mesozoic calcimicrobial structure
Bruno R.C. GRANIER
| HTML
| PDF [3,800 KB]
| DOI: 10.2110/carnets.2021.2101
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Abstract: The controversy surrounding Bacinella
irregularis Radoičić, 1959, and Lithocodium aggregatum
Elliott, 1956, has involved both sedimentologists and paleontologists.
Arguments to exclude them from the Codiaceae are reviewed. The same arguments
may be advanced to exclude their ascription to most other organisms. The only
hypothesis resisting all elements of disproof is that of a consortium involving
microbial communities. Accordingly, these structures are treated here as
biosedimentary structures, namely bacinella structures, and not as taxa. One of the features
specific to the organisms that built these structures is their strong corroding ability, as
shown by the examples of fossils partly or fully cannibalized. This represents
one state of corrosion beyond surficial etching and borings. Besides their capacity to corrode calcareous substrates, these
microbial organisms formed nodules or oncoids and even built biostromes, which, depending on their stage of development, may
have formed soft, firm or even hard substrates. However, to our knowledge, microbial
communities contributing to bacinella
structures never built up any bioherm. To complete this summary review, a
building-block model that coherently takes into account most architectural
variations is presented in the form of a figure sketch. The endolithic
foraminifer Troglotella incrustans, which is commonly found associated with bacinella structures, is
not an encruster or a borer. Lastly, contrary to certain erroneous hypotheses, no
major bacinella episode has been ever found coeval with any significant Oceanic Anoxic Event.
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Carnets Geol., vol. 21, no. 1, p. 1-25
Online since January 21, 2021
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