Olimpiu Neamţu, I. Bucur, Răzvan Ungureanu, C. V. Mircescu
The Hăgimas Massif provides important data for reconstructing the geological evolution of the Transylvanian Carbonate Platform. This unit is present nowadays in the basement of the Transylvanian Depression and as large-scale olistoliths, which crop out in various locations in the Eastern Carpathians and Apuseni Mountains. They contain a large variety of microfacies as well as microfossil assemblages partly encompassing the Jurassic/Cretaceous boundary. This study presents a detailed account of uppermost Jurassic-lowermost Cretaceous limestones from the Lapos Valley (Hăghimas Mountains) containing two distinct successions separated by a fault. The first succession contains platform margin and inner platform deposits (subtidal, intertidal) whereas the second one consists of inner platform deposits (shallow-subtidal to peritidal carbonates). The Upper Jurassic Stramberk-type facies is overlain by lower Berriasian regressive peritidal limestones. The upper Berriasian-? lower Valanginian consists mainly of inner platform deposits. They contain alternating, high and low-energy carbonates with rare calpionellids and calcispheres. The age assignment is based on a rich and diverse micropaleontological assemblage containing similar biota reported from other regions of the Tethysian Realm.
{"title":"Upper Jurassic-Lower Cretaceous limestones from the Hăghimaș Massif (Eastern Carpathians, Romania): Microfacies, microfossils and depositional environments","authors":"Olimpiu Neamţu, I. Bucur, Răzvan Ungureanu, C. V. Mircescu","doi":"10.4267/2042/70499","DOIUrl":"https://doi.org/10.4267/2042/70499","url":null,"abstract":"The Hăgimas Massif provides important data for reconstructing the geological evolution of the Transylvanian Carbonate Platform. This unit is present nowadays in the basement of the Transylvanian Depression and as large-scale olistoliths, which crop out in various locations in the Eastern Carpathians and Apuseni Mountains. They contain a large variety of microfacies as well as microfossil assemblages partly encompassing the Jurassic/Cretaceous boundary. This study presents a detailed account of uppermost Jurassic-lowermost Cretaceous limestones from the Lapos Valley (Hăghimas Mountains) containing two distinct successions separated by a fault. The first succession contains platform margin and inner platform deposits (subtidal, intertidal) whereas the second one consists of inner platform deposits (shallow-subtidal to peritidal carbonates). The Upper Jurassic Stramberk-type facies is overlain by lower Berriasian regressive peritidal limestones. The upper Berriasian-? lower Valanginian consists mainly of inner platform deposits. They contain alternating, high and low-energy carbonates with rare calpionellids and calcispheres. The age assignment is based on a rich and diverse micropaleontological assemblage containing similar biota reported from other regions of the Tethysian Realm.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"85 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83911395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lower Jurassic (Hettangian-Pliensbachian) shallow-marine ooidal limestones of southern Montenegro contain a large number of isocrinid ossicles. They are assigned to the following taxa: Isocrinus psilonoti (Quenstedt), Isocrinus sp., and Pentacrinites cf. fossilis Blumenbach. The echinoderm assemblage also yields cyrtocrinid ossicles (Cotylederma sp., Cyrtocrinina indet.) and echinoid spines (only spotted in thin sections); however, these elements are rare. Given the fact that the recorded assemblage comes from a single locality, there is a growing need for further research that will require intense sampling to compile and complete the faunal list of crinoids and other echinoderm taxa.
{"title":"A new prospect in crinoid (Crinoidea, Echinodermata) research: An example from the Lower Jurassic of Montenegro","authors":"M. Salamon","doi":"10.4267/2042/70491","DOIUrl":"https://doi.org/10.4267/2042/70491","url":null,"abstract":"Lower Jurassic (Hettangian-Pliensbachian) shallow-marine ooidal limestones of southern Montenegro contain a large number of isocrinid ossicles. They are assigned to the following taxa: Isocrinus psilonoti (Quenstedt), Isocrinus sp., and Pentacrinites cf. fossilis Blumenbach. The echinoderm assemblage also yields cyrtocrinid ossicles (Cotylederma sp., Cyrtocrinina indet.) and echinoid spines (only spotted in thin sections); however, these elements are rare. Given the fact that the recorded assemblage comes from a single locality, there is a growing need for further research that will require intense sampling to compile and complete the faunal list of crinoids and other echinoderm taxa.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"61 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74124629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. O. Martha, K. Matsuyama, J. Scholz, P. Taylor, G. Hillmer
The bryozoan collection of Prof. Dr Ehrhard Voigt (1905–2004) at the Senckenberg Research Institute in Frankfurt am Main, Germany is a world-renowned collection of great scientific value. It is the world's largest collection of fossil bryozoans from the Upper Cretaceous and Paleocene and a unique archive documenting the evolution of this phylum of marine invertebrates during this time interval in the Boreal Chalk Sea that extended from the British Isles to the Aral Sea in Central Asia. The Voigt Collection contains over 300,000 specimens and was relocated to the Senckenberg Institute in 2005 according to the bequest of Ehrhard Voigt. As a result of a DFG-funded project, we present here a three-part type catalogue of the holotypes and neotypes of 256 bryozoan species in the Voigt Collection, of which this is Part 3. In total over the three parts, 247 species are re-illustrated but the name-bearing type specimens of 20 species are missing and no material could be found for 9 species. Two species, described as ctenostome bryozoans by Ehrhard Voigt, are questionable, while a further three 'ctenostome' species and one 'ctenostome' genus are considered as ichnotaxa.
{"title":"The bryozoan collection of Prof. Dr Ehrhard Voigt (1905–2004) at the Senckenberg Institute in Frankfurt. Part 3 - Ascophoran Cheilostomata and bibliography","authors":"S. O. Martha, K. Matsuyama, J. Scholz, P. Taylor, G. Hillmer","doi":"10.4267/2042/70501","DOIUrl":"https://doi.org/10.4267/2042/70501","url":null,"abstract":"The bryozoan collection of Prof. Dr Ehrhard Voigt (1905–2004) at the Senckenberg Research Institute in Frankfurt am Main, Germany is a world-renowned collection of great scientific value. It is the world's largest collection of fossil bryozoans from the Upper Cretaceous and Paleocene and a unique archive documenting the evolution of this phylum of marine invertebrates during this time interval in the Boreal Chalk Sea that extended from the British Isles to the Aral Sea in Central Asia. The Voigt Collection contains over 300,000 specimens and was relocated to the Senckenberg Institute in 2005 according to the bequest of Ehrhard Voigt. As a result of a DFG-funded project, we present here a three-part type catalogue of the holotypes and neotypes of 256 bryozoan species in the Voigt Collection, of which this is Part 3. In total over the three parts, 247 species are re-illustrated but the name-bearing type specimens of 20 species are missing and no material could be found for 9 species. Two species, described as ctenostome bryozoans by Ehrhard Voigt, are questionable, while a further three 'ctenostome' species and one 'ctenostome' genus are considered as ichnotaxa.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78532444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. O. Martha, K. Matsuyama, J. Scholz, P. Taylor, G. Hillmer
The bryozoan collection of Prof. Dr Ehrhard Voigt (1905-2004) at the Senckenberg Research Institute in Frankfurt am Main, Germany is a world-renowned collection of great scientific value. It is the world's largest collection of fossil bryozoans from the Upper Cretaceous and Paleocene and a unique archive documenting the evolution of this phylum of marine invertebrates during this time interval in the Boreal Chalk Sea that extended from the British Isles to the Aral Sea in Central Asia. The Voigt Collection contains over 300,000 specimens and was relocated to the Senckenberg Institute in 2005 according to the bequest of Ehrhard Voigt. As a result of a DFG-funded project, we present here a three-part type catalogue of the holotypes and neotypes of 256 bryozoan species in the Voigt Collection, of which this is Part 2. In total over the three parts, 247 species are re-illustrated but the name-bearing type specimens of 20 species are missing and no material could be found for 9 species. Two species, described as ctenostome bryozoans by Ehrhard Voigt, are questionable, while a further three 'ctenostome' species and one 'ctenostome' genus are considered as ichnotaxa.
{"title":"The bryozoan collection of Prof. Dr Ehrhard Voigt (1905–2004) at the Senckenberg Institute in Frankfurt. Part 2 - Ctenostomata and non-ascophoran Cheilostomata","authors":"S. O. Martha, K. Matsuyama, J. Scholz, P. Taylor, G. Hillmer","doi":"10.4267/2042/70498","DOIUrl":"https://doi.org/10.4267/2042/70498","url":null,"abstract":"The bryozoan collection of Prof. Dr Ehrhard Voigt (1905-2004) at the Senckenberg Research Institute in Frankfurt am Main, Germany is a world-renowned collection of great scientific value. It is the world's largest collection of fossil bryozoans from the Upper Cretaceous and Paleocene and a unique archive documenting the evolution of this phylum of marine invertebrates during this time interval in the Boreal Chalk Sea that extended from the British Isles to the Aral Sea in Central Asia. The Voigt Collection contains over 300,000 specimens and was relocated to the Senckenberg Institute in 2005 according to the bequest of Ehrhard Voigt. As a result of a DFG-funded project, we present here a three-part type catalogue of the holotypes and neotypes of 256 bryozoan species in the Voigt Collection, of which this is Part 2. In total over the three parts, 247 species are re-illustrated but the name-bearing type specimens of 20 species are missing and no material could be found for 9 species. Two species, described as ctenostome bryozoans by Ehrhard Voigt, are questionable, while a further three 'ctenostome' species and one 'ctenostome' genus are considered as ichnotaxa.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"75 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73923909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Les marnes cenomaniennes de la region de Batna (nord-est de l'Algerie) montrent plusieurs niveaux fossiliferes, a faune tres diversifiee. Parmi les fossiles presents en abondance et en bon etat de conservation figure Aspidiscus cristatus (Lamarck, 1801). Cette espece de polypier a ete rattachee a la famille des Latomeandridae Alloiteau, 1952, en raison de la presence de pennulae et de perforations concentrees sur le bord interne des septes. Dans les coupes etudiees, Aspidiscus cristatus se rencontre dans des niveaux allant de la Zone a Cunningtoniceras inerme a la Zone a Acanthoceras amphibolum, avec une relative abondance dans la Zone a Acanthoceras cf. rhotomagense. Cette espece est, par consequent, un bon marqueur du Cenomanien moyen de la region de Batna. Nous donnons ici une description paleontologique et discutons des cadres environnemental et paleogeographique de cette espece. En effet, la morphologie externe de son test, convexe sur la face superieure, plane a concave sur la face inferieure, evoque une adaptation a des environnements marins de faible energie, de substrat vaseux et au taux de sedimentation eleve. La repartition paleogeographique de cette espece, avec des specimens de taille souvent plus grande sur les marges sud et est du domaine tethysien que sur la marge nord, temoigne d'un gradient thermique et d'une zonation climatique specifiques, avec des eaux relativement plus chaudes sur la marge sud-tethysienne au Cenomanien, favorisant une bio-erosion beaucoup plus frequente et plus poussee des specimens fossiles des regions sud-tethysiennes que celle affectant les specimens des regions septentrionales de la Tethys.
{"title":"Abondance d'Aspidiscus cristatus (Lamarck, 1801) dans la Formation des Marnes de Smail de la région de Batna (NE d'Algérie) : Une espèce caractéristique pour le Cénomanien moyen","authors":"S. Salmi-Laouar, B. Ferré, R. Aouissi","doi":"10.4267/2042/70294","DOIUrl":"https://doi.org/10.4267/2042/70294","url":null,"abstract":"Les marnes cenomaniennes de la region de Batna (nord-est de l'Algerie) montrent plusieurs niveaux fossiliferes, a faune tres diversifiee. Parmi les fossiles presents en abondance et en bon etat de conservation figure Aspidiscus cristatus (Lamarck, 1801). Cette espece de polypier a ete rattachee a la famille des Latomeandridae Alloiteau, 1952, en raison de la presence de pennulae et de perforations concentrees sur le bord interne des septes. Dans les coupes etudiees, Aspidiscus cristatus se rencontre dans des niveaux allant de la Zone a Cunningtoniceras inerme a la Zone a Acanthoceras amphibolum, avec une relative abondance dans la Zone a Acanthoceras cf. rhotomagense. Cette espece est, par consequent, un bon marqueur du Cenomanien moyen de la region de Batna. Nous donnons ici une description paleontologique et discutons des cadres environnemental et paleogeographique de cette espece. En effet, la morphologie externe de son test, convexe sur la face superieure, plane a concave sur la face inferieure, evoque une adaptation a des environnements marins de faible energie, de substrat vaseux et au taux de sedimentation eleve. La repartition paleogeographique de cette espece, avec des specimens de taille souvent plus grande sur les marges sud et est du domaine tethysien que sur la marge nord, temoigne d'un gradient thermique et d'une zonation climatique specifiques, avec des eaux relativement plus chaudes sur la marge sud-tethysienne au Cenomanien, favorisant une bio-erosion beaucoup plus frequente et plus poussee des specimens fossiles des regions sud-tethysiennes que celle affectant les specimens des regions septentrionales de la Tethys.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"20 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84275090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
It is shown that the species names Palaeothrissum inaequilobum BLAINVILLE, 1818, and P. parvum BLAINVILLE, 1818, from the Lower Permian (Asselian) of Muse, near Autun (Saone-et-Loire department, France) are senior synonyms of the widely used species name, Aeduella blainvillei (AGASSIZ, 1833). In the interest of nomenclatural stability, conditions exist which allow reversal of precedence as stated in Article 23.9.1 of the International Code of Zoological Nomenclature. Thus the species name Aeduella blainvillei (AGASSIZ, 1833) is regarded as valid, qualifying as a nomen protectum, whereas Palaeothrissum inaequilobum BLAINVILLE, 1818, and P. parvum BLAINVILLE, 1818, are invalid, qualifying as nomina oblita. Some of the specimens from the type series upon which P. inaequilobum, P. parvum and Aeduella blainvillei were erected, are identified.
{"title":"The nomenclatural status of Palaeothrissum inaequilobum Blainville, 1818, P. parvum Blainville, 1818, and Aeduella blainvillei (Agassiz, 1833) (Actinopterygii, Aeduellidae)","authors":"Arnaud Brignon","doi":"10.4267/2042/70290","DOIUrl":"https://doi.org/10.4267/2042/70290","url":null,"abstract":"It is shown that the species names Palaeothrissum inaequilobum BLAINVILLE, 1818, and P. parvum BLAINVILLE, 1818, from the Lower Permian (Asselian) of Muse, near Autun (Saone-et-Loire department, France) are senior synonyms of the widely used species name, Aeduella blainvillei (AGASSIZ, 1833). In the interest of nomenclatural stability, conditions exist which allow reversal of precedence as stated in Article 23.9.1 of the International Code of Zoological Nomenclature. Thus the species name Aeduella blainvillei (AGASSIZ, 1833) is regarded as valid, qualifying as a nomen protectum, whereas Palaeothrissum inaequilobum BLAINVILLE, 1818, and P. parvum BLAINVILLE, 1818, are invalid, qualifying as nomina oblita. Some of the specimens from the type series upon which P. inaequilobum, P. parvum and Aeduella blainvillei were erected, are identified.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"30 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88114889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
New findings of esthonioporate bryozoans of the species Revalotrypa cf. inopinata, representing one of the oldest bryozoans of Baltoscandia, are described from an outcrop located in Leningrad Oblast' (north-western Russia). The colonies of this species are very small and were extracted from limestone-cemented nodules found in glauconitic sandstones of the lower part of the Joa Member (Paroistodus proteus conodont zone, lowermost Floian, Lower Ordovician). Combined X-ray microtomography and the examination of traditional thin sections under a stereomicroscope and a light microscope were used to study the morphology of this species.
{"title":"New findings of the genus Revalotrypa, the oldest bryozoan genus of Baltoscandia, in north-western Russia","authors":"P. Fedorov, A. V. Koromyslova","doi":"10.4267/2042/70296","DOIUrl":"https://doi.org/10.4267/2042/70296","url":null,"abstract":"New findings of esthonioporate bryozoans of the species Revalotrypa cf. inopinata, representing one of the oldest bryozoans of Baltoscandia, are described from an outcrop located in Leningrad Oblast' (north-western Russia). The colonies of this species are very small and were extracted from limestone-cemented nodules found in glauconitic sandstones of the lower part of the Joa Member (Paroistodus proteus conodont zone, lowermost Floian, Lower Ordovician). Combined X-ray microtomography and the examination of traditional thin sections under a stereomicroscope and a light microscope were used to study the morphology of this species.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"17 3 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79359745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
On the southern margin of the Vocontian Basin (SE France), for taphonomic reasons (fragmentation, reworking, pyritization), lower Aptian (Lower Cretaceous) deposits of the interval between the Deshayesites deshayesi and Dufrenoyia furcata zones are usually not suitable for studying the late ontogenetic developments of ammonites (fossil cephalopods). In the vicinity of the village of Les Ferres (Department of the Alpes-Maritimes, SE France), a relatively thick sedimentary succession with well-preserved ammonites, representative of the zones mentioned above, is found in a small basin called the "Les Ferres Aptian Basin" (LFAB). The 1262 ammonites collected or studied in situ are dated from the Deshayesites forbesi Zone through the top of the Dufrenoyia furcata Zone. This study presents the lithostratigraphy, biostratigraphy derived from these ammonites, and the respective range of these taxa. This is an introductory contribution to any future palaeontological study of the lower Aptian ammonites in the Les Ferres area. The lithologic unit overlying the Hauterivian-Aptian limestones is introduced herein as the Les Graous Formation. It is subdivided in three members, from bottom to top: 1) the Combe de Joinet Member, 2) the Pont de la Cerise Member, and 3) the Les Graous Member. In addition, two remarkable levels are identified: the Ammonitoceras level (outstandingly abundant) and the Toxoceratoides bed.
在法国东南部Vocontian盆地南缘，Deshayesites deshayesi和Dufrenoyia furata带之间的下Aptian(下白垩统)沉积物，由于破碎、改造、黄铁矿化等地学原因，通常不适合研究菊石(头足类化石)的晚期个体发育。在Les Ferres村(法国东南部阿尔卑斯滨海省)附近，在一个名为“Les Ferres Aptian盆地”(LFAB)的小盆地中发现了一层相对较厚的沉积序列，其中保存完好的ammonites代表了上述区域。就地收集或研究的1262块菊石的年代从Deshayesites forbesi带一直到Dufrenoyia furata带的顶部。本文介绍了这些菊石的岩石地层学和生物地层学，以及这些分类群的分布范围。这是对Les Ferres地区下阿普提亚菊石的任何未来古生物学研究的介绍性贡献。本文介绍了覆盖在豪特里维亚-阿普梯灰岩上的岩性单元为莱斯格劳斯组。它被细分为三个成员，从下到上:1)Combe de Joinet成员，2)Pont de la Cerise成员，3)Les Graous成员。此外，还发现了两个显著的水平:Ammonitoceras水平(非常丰富)和Toxoceratoides床。
{"title":"The lower Aptian ammonites of the Les Ferres Aptian Basin (Lower Cretaceous, Southeast of France) Part I: Introduction and biostratigraphy","authors":"Stéphane Bersac, D. Bert","doi":"10.4267/2042/70292","DOIUrl":"https://doi.org/10.4267/2042/70292","url":null,"abstract":"On the southern margin of the Vocontian Basin (SE France), for taphonomic reasons (fragmentation, reworking, pyritization), lower Aptian (Lower Cretaceous) deposits of the interval between the Deshayesites deshayesi and Dufrenoyia furcata zones are usually not suitable for studying the late ontogenetic developments of ammonites (fossil cephalopods). In the vicinity of the village of Les Ferres (Department of the Alpes-Maritimes, SE France), a relatively thick sedimentary succession with well-preserved ammonites, representative of the zones mentioned above, is found in a small basin called the \"Les Ferres Aptian Basin\" (LFAB). The 1262 ammonites collected or studied in situ are dated from the Deshayesites forbesi Zone through the top of the Dufrenoyia furcata Zone. This study presents the lithostratigraphy, biostratigraphy derived from these ammonites, and the respective range of these taxa. This is an introductory contribution to any future palaeontological study of the lower Aptian ammonites in the Les Ferres area. The lithologic unit overlying the Hauterivian-Aptian limestones is introduced herein as the Les Graous Formation. It is subdivided in three members, from bottom to top: 1) the Combe de Joinet Member, 2) the Pont de la Cerise Member, and 3) the Les Graous Member. In addition, two remarkable levels are identified: the Ammonitoceras level (outstandingly abundant) and the Toxoceratoides bed.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"106 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80731682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdelkader Abbache, Abdelkader Ouali Mehadji, C. Crônier, Ahmed hamza Felllah, N. Allaire, C. Monnet
Sur la bordure nord-ouest du Sahara algerien, dans les bassins de Bechar (Ben-Zireg), de l'Ougarta (Marhouma) et du Gourara (Charouine), le Devonien superieur est marque par les calcaires noduleux de type "griotte" qui s'echelonnent depuis le Frasnien jusqu'au Famennien (Devonien). Il s'agit d'alternances argilo-greso-calcaires riches en ammonoides. Des variations laterales de facies et d'epaisseur sont observees dans ces trois bassins. Ces variations sont directement liees aux conditions de leur environnement de depots (hydrodynamisme, physiographie du bassin, arrets sedimentaires). Dans les trois regions etudiees, les milieux de depot des facies griottes correspondent a un environnement de type plateforme (hauts fonds) et bassin sous controle tectono-eustatique. A Ben-Zireg, les facies correspondent a une plateforme. A Marhouma, les facies correspondent d'abord a une rampe distale, puis a un environnement de talus a tablier a facies allodapiques (Famennien II, VI et V) et de bassin (Famennien II et VI). A la fin du Famennien, on assiste a l'installation d'une sedimentation argilo-sableuse de talus (Membre inferieur des Gres de Ouarourout) rapidement relayee par la mise en place d'une plateforme (Membre superieur des Gres de Ouarourout) avant emersion. A Charouine, les argiles du bassin (hemipelagites) dominent la sedimentation. La presence d'asphaltites sous forme d'impregnation dans les facies griottes, de galettes centimetriques et de blocs metriques dans les facies posterieurs aux calcaires noduleux, suggere les effets d'une diagenese precoce qui a du egalement jouer un role important par la reduction des sulfates et l'oxydation anaerobique du methane (biogenique et/ou thermique). La segregation d'aires sedimentaires a facies griotte semble etre calquee sur un morcellement du socle. En effet, les facies griottes suivent de pres la suture panafricaine. Dans l'Ougarta, l'accident "Sud Ougartien" ne serait que le prolongement du megalineament du Tibesti. La reactivation au Devonien superieur des fractures du socle precambrien serait responsable de ce contraste des facies.
{"title":"Le dévonien supérieur du sahara nord-occidental (algérie) : faciès, environnements et signification géodynamique des calcaires griottes","authors":"Abdelkader Abbache, Abdelkader Ouali Mehadji, C. Crônier, Ahmed hamza Felllah, N. Allaire, C. Monnet","doi":"10.4267/2042/70192","DOIUrl":"https://doi.org/10.4267/2042/70192","url":null,"abstract":"Sur la bordure nord-ouest du Sahara algerien, dans les bassins de Bechar (Ben-Zireg), de l'Ougarta (Marhouma) et du Gourara (Charouine), le Devonien superieur est marque par les calcaires noduleux de type \"griotte\" qui s'echelonnent depuis le Frasnien jusqu'au Famennien (Devonien). Il s'agit d'alternances argilo-greso-calcaires riches en ammonoides. Des variations laterales de facies et d'epaisseur sont observees dans ces trois bassins. Ces variations sont directement liees aux conditions de leur environnement de depots (hydrodynamisme, physiographie du bassin, arrets sedimentaires). Dans les trois regions etudiees, les milieux de depot des facies griottes correspondent a un environnement de type plateforme (hauts fonds) et bassin sous controle tectono-eustatique. A Ben-Zireg, les facies correspondent a une plateforme. A Marhouma, les facies correspondent d'abord a une rampe distale, puis a un environnement de talus a tablier a facies allodapiques (Famennien II, VI et V) et de bassin (Famennien II et VI). A la fin du Famennien, on assiste a l'installation d'une sedimentation argilo-sableuse de talus (Membre inferieur des Gres de Ouarourout) rapidement relayee par la mise en place d'une plateforme (Membre superieur des Gres de Ouarourout) avant emersion. A Charouine, les argiles du bassin (hemipelagites) dominent la sedimentation. La presence d'asphaltites sous forme d'impregnation dans les facies griottes, de galettes centimetriques et de blocs metriques dans les facies posterieurs aux calcaires noduleux, suggere les effets d'une diagenese precoce qui a du egalement jouer un role important par la reduction des sulfates et l'oxydation anaerobique du methane (biogenique et/ou thermique). La segregation d'aires sedimentaires a facies griotte semble etre calquee sur un morcellement du socle. En effet, les facies griottes suivent de pres la suture panafricaine. Dans l'Ougarta, l'accident \"Sud Ougartien\" ne serait que le prolongement du megalineament du Tibesti. La reactivation au Devonien superieur des fractures du socle precambrien serait responsable de ce contraste des facies.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"530 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80172099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
On the occasion of the inventory of the J. Emberger Collection, specimens from the "Lower Cretaceous" (Valanginian and Hauterivian) of Algeria, which are referable to the genus Actinoporella (Gumbel in Alth) and which were earlier identified to its type-species A. podolica (Alth) by Conrad et al., are re-examined. They correspond to two discrete species, one of which could be a junior synonym of A. podolica, a synonymy that remains pending because it would require a new sampling at the original locality in western Ukraine some 140 years after the original specimens, now lost, were collected. Regarding their age ascription, they are Tithonian and/or Berriasian in age, i.e., latest Jurassic (sensu Oppel) in age, not earliest Cretaceous. In addition to these two Actinoporellas, a third discrete species, initially described as Clypeina nigra (Conrad & Peybernes), but later referred to the genus Actinoporella, is revised. New data justify its re-ascription to the genus Bakalovaella Bucur. Finally, it is now confirmed that both the Polyphysaceae and the modern Dasycladaceae derive from the Diploporaceae either directly or indirectly through the ancestral Dasycladaceae.
值此j . Emberger库存收集、标本的“下白垩统”(凡兰吟阶和欧特里夫期)阿尔及利亚、是可参考的属Actinoporella (Alth耿贝尔)和早期识别的模式种a podolica (Alth)康拉德et al .,重新检验。它们对应于两个独立的物种，其中一个可能是podolica的初级同义词，这个同义词仍然悬而未决，因为它需要在乌克兰西部的原始地点进行新的采样，大约140年后，原始标本被收集到，现在已经丢失了。关于它们的年龄归属，它们属于梯通纪和/或贝里亚纪，即侏罗纪晚期(sensu Oppel)，而不是白垩纪早期。除了这两种放线菌外，第三种独立的物种，最初被描述为Clypeina nigra (Conrad & Peybernes)，但后来被称为放线菌属，被修订。新的数据证明其重新归属于Bakalovaella Bucur属。最后，证实了多壶科和现代水仙科都是直接或间接通过其祖先水仙科衍生而来的。
{"title":"Observations on some Actinoporellas (Chlorophyta, Polyphysaceae). Revision of the Jacques Emberger Collection. Part 1","authors":"B. Granier","doi":"10.4267/2042/70196","DOIUrl":"https://doi.org/10.4267/2042/70196","url":null,"abstract":"On the occasion of the inventory of the J. Emberger Collection, specimens from the \"Lower Cretaceous\" (Valanginian and Hauterivian) of Algeria, which are referable to the genus Actinoporella (Gumbel in Alth) and which were earlier identified to its type-species A. podolica (Alth) by Conrad et al., are re-examined. They correspond to two discrete species, one of which could be a junior synonym of A. podolica, a synonymy that remains pending because it would require a new sampling at the original locality in western Ukraine some 140 years after the original specimens, now lost, were collected. Regarding their age ascription, they are Tithonian and/or Berriasian in age, i.e., latest Jurassic (sensu Oppel) in age, not earliest Cretaceous. In addition to these two Actinoporellas, a third discrete species, initially described as Clypeina nigra (Conrad & Peybernes), but later referred to the genus Actinoporella, is revised. New data justify its re-ascription to the genus Bakalovaella Bucur. Finally, it is now confirmed that both the Polyphysaceae and the modern Dasycladaceae derive from the Diploporaceae either directly or indirectly through the ancestral Dasycladaceae.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"174 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78553888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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