Reexamination of the type specimen described by Barrande in 1887 as "Tige d'une Cystidee indeterminee" shows that this unique specimen represents an articulated but incomplete remnant of the gogiid eocrinoid Akadocrinus jani Prokop. The specimen is preserved as an external mould in shale from the mid-Cambrian Jince Formation, and comprises a proximal part of a stem associated with a slightly disarticulated distal portion of a theca, composed of over twenty polygonal plates. With the exception of the basal-most plates, all other preserved thecal plates bear ellipsoidal marginal epispires, and substantiate assignment of this specimen to the epispire-bearing phase in ontogenetic development of Akadocrinus.
对Barrande在1887年描述为“Tige d'une Cystidee indeterminee”的模式标本的重新检查表明，这一独特的标本代表了gogiid eoclinoid Akadocrinus jani Prokop的一个铰结但不完整的遗迹。该标本作为一个外部模子保存在中寒武纪金ince组的页岩中，包括一个茎的近端部分和一个由20多个多边形板组成的膜的稍微断裂的远端部分。除了最基部的板外，其余保存完好的鞘板均有椭球状边缘上盖，这证实了该标本在Akadocrinus个体发育中处于上盖阶段。
{"title":"Revision of the Barrande's specimen \"Tige d'une Cystidée indéterminée\" (Cambrian, Echinodermata, Eocrinoidea)","authors":"Martina Nohejlová, Oldřich Fatka","doi":"10.4267/2042/62768","DOIUrl":"https://doi.org/10.4267/2042/62768","url":null,"abstract":"Reexamination of the type specimen described by Barrande in 1887 as \"Tige d'une Cystidee indeterminee\" shows that this unique specimen represents an articulated but incomplete remnant of the gogiid eocrinoid Akadocrinus jani Prokop. The specimen is preserved as an external mould in shale from the mid-Cambrian Jince Formation, and comprises a proximal part of a stem associated with a slightly disarticulated distal portion of a theca, composed of over twenty polygonal plates. With the exception of the basal-most plates, all other preserved thecal plates bear ellipsoidal marginal epispires, and substantiate assignment of this specimen to the epispire-bearing phase in ontogenetic development of Akadocrinus.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"17 1","pages":"153-160"},"PeriodicalIF":1.4,"publicationDate":"2017-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4267/2042/62768","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45386020","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}
The specific diversity of Brachiopoda is proposed for the first time in an atlas of the Southern Ocean with maps for each genus in the Antarctic and sub-Antarctic zones. The three sub-phyla Linguliformea, Craniiformea and Rhynchonelliformea are represented: 51 species, belonging to 35 genera occur on a surface area covering about 20% of World Ocean. The low diversity is confirmed, as only 12.6% of the total number of extant species of brachiopods (402) and 29.4% of that of the genera (119). The absence of reliable diagnoses in most of the species makes difficult some comparisons and attributions. In the future several of these species and even genera could be considered as synonymous.
{"title":"Atlas of Antarctic and sub-Antarctic Brachiopoda","authors":"C. Emig","doi":"10.4267/2042/62545","DOIUrl":"https://doi.org/10.4267/2042/62545","url":null,"abstract":"The specific diversity of Brachiopoda is proposed for the first time in an atlas of the Southern Ocean with maps for each genus in the Antarctic and sub-Antarctic zones. The three sub-phyla Linguliformea, Craniiformea and Rhynchonelliformea are represented: 51 species, belonging to 35 genera occur on a surface area covering about 20% of World Ocean. The low diversity is confirmed, as only 12.6% of the total number of extant species of brachiopods (402) and 29.4% of that of the genera (119). The absence of reliable diagnoses in most of the species makes difficult some comparisons and attributions. In the future several of these species and even genera could be considered as synonymous.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2017-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42282917","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}
{"title":"Brachiopodes actuels : historique et révision de la collection D.-P. Œhlert (Laval) ; brachiopodes des côtes françaises métropolitaines","authors":"F. Álvarez, C. Emig, J. Tréguier","doi":"10.4267/2042/62544","DOIUrl":"https://doi.org/10.4267/2042/62544","url":null,"abstract":"","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4267/2042/62544","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48375191","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}
The Pinda Group of the Congo basin in the northern Angolan offshore is an overall transgressive supersequence of late Aptian - ? early Cenomanian age. Due to synsedimentary salt tectonics of the underlying Loeme Salt, the original ramp arrangement is split into discrete structures corresponding to many proven, probable and possible oil and gas plays. Where the biostratigraphic information was not destroyed by pervasive dolomitization, the little that remains is not available to the general public because it is treated as proprietary data by the Sociedade Nacional de Combustiveis de Angola Empresa Publica – Sonangol E.P. Only a limited set of data containing lithostratigraphic information (e.g., some published well logs and photomicrographs of facies) is available. The aim of this paper is to give a little more information about the Pinda stratigraphy. For instance, to be formally defined, this poorly known unit required a type section, a shortcoming that is addressed here. The wireline log signatures of some regional seismic markers are documented because they are used to correlate wells and subdivide the Group into formations. The microfacies corresponding to some key electrofacies as well as the porosity types are also condensed in a microphotograph catalog. Finally, few examples of typical LoC (i.e., Line of Correlation) diagrams are displayed and interpreted.
安哥拉北部近海刚果盆地品达群是阿普天晚期的一个整体海侵上序。早期的诺曼尼亚时代。由于下伏Loeme盐的同沉积盐构造，原有的斜坡构造被分割成离散的构造，对应于许多已探明的、可能的和可能的油气层。如果生物地层信息没有被普遍的白云化破坏，那么剩下的少量信息就无法向公众提供，因为它被安哥拉国家石油公司(Sociedade Nacional de is de Angola Empresa Publica - Sonangol E.P.)视为专有数据。只有有限的一组包含岩石地层信息的数据(例如，一些已发表的测井曲线和相的显微照片)可供使用。本文的目的是提供更多关于坪达地层的信息。例如，要正式定义这个鲜为人知的单元，需要一个类型部分，这里将解决这个缺点。一些区域地震标志的电缆测井特征被记录下来，因为它们用于对比井并将该组细分为地层。在显微照片目录中也浓缩了一些关键电相对应的微相以及孔隙类型。最后，将显示和解释几个典型LoC(即相关线)图的示例。
{"title":"New stratigraphic and genetic model for the dolomitic cretaceous pinda reservoirs in angola part I-the pinda of angola, an integrated lithostratigraphic approach","authors":"B. Granier","doi":"10.4267/2042/62283","DOIUrl":"https://doi.org/10.4267/2042/62283","url":null,"abstract":"The Pinda Group of the Congo basin in the northern Angolan offshore is an overall transgressive supersequence of late Aptian - ? early Cenomanian age. Due to synsedimentary salt tectonics of the underlying Loeme Salt, the original ramp arrangement is split into discrete structures corresponding to many proven, probable and possible oil and gas plays. Where the biostratigraphic information was not destroyed by pervasive dolomitization, the little that remains is not available to the general public because it is treated as proprietary data by the Sociedade Nacional de Combustiveis de Angola Empresa Publica – Sonangol E.P. Only a limited set of data containing lithostratigraphic information (e.g., some published well logs and photomicrographs of facies) is available. The aim of this paper is to give a little more information about the Pinda stratigraphy. For instance, to be formally defined, this poorly known unit required a type section, a shortcoming that is addressed here. The wireline log signatures of some regional seismic markers are documented because they are used to correlate wells and subdivide the Group into formations. The microfacies corresponding to some key electrofacies as well as the porosity types are also condensed in a microphotograph catalog. Finally, few examples of typical LoC (i.e., Line of Correlation) diagrams are displayed and interpreted.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"17 1","pages":"105-127"},"PeriodicalIF":1.4,"publicationDate":"2017-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46634836","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}
Eight macrofacies types (5) plus subtypes (3) were identified while measuring sections along the Mussafah channel profile. These include: • aeolian sands, • microbial mat and microbial-laminated sediments, • gypsum and enterolithic anhydrite, i.e., a diagenetic variation of the previous facies, • muds with small pelecypods, and • its seagrass meadow version, • Potamid sands, and • its cemented version, i.e., the Potamid beach-rock, • washover fan coquina. A complete set of analyses, including granulometry, mineral composition, clay composition, TOC, and identification of the allochems and the microfossils, was performed on this material. The facies and their genetic setting, i.e., the sequence of facies, provide a perspective on both the environmental and stratigraphical significance of their distribution, both lateral and vertical, and an example of the application of the Walther's law. The lower microbial mat is the mark of a transgression whereas the upper microbial mat is the mark of a forced regression. In conclusion, the sequence of facies allows identification of the last Holocene transgressive-regressive cycle that includes a forced regression, which probably dates back to 6,000 years BP.
{"title":"Sedimentological investigation on Holocene deposits in the Mussafah channel (Abu Dhabi, United Arab Emirates)","authors":"B. Granier, R. Boichard","doi":"10.4267/2042/62267","DOIUrl":"https://doi.org/10.4267/2042/62267","url":null,"abstract":"Eight macrofacies types (5) plus subtypes (3) were identified while measuring sections along the Mussafah channel profile. These include: • aeolian sands, • microbial mat and microbial-laminated sediments, • gypsum and enterolithic anhydrite, i.e., a diagenetic variation of the previous facies, • muds with small pelecypods, and • its seagrass meadow version, • Potamid sands, and • its cemented version, i.e., the Potamid beach-rock, • washover fan coquina. A complete set of analyses, including granulometry, mineral composition, clay composition, TOC, and identification of the allochems and the microfossils, was performed on this material. The facies and their genetic setting, i.e., the sequence of facies, provide a perspective on both the environmental and stratigraphical significance of their distribution, both lateral and vertical, and an example of the application of the Walther's law. The lower microbial mat is the mark of a transgression whereas the upper microbial mat is the mark of a forced regression. In conclusion, the sequence of facies allows identification of the last Holocene transgressive-regressive cycle that includes a forced regression, which probably dates back to 6,000 years BP.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"17 1","pages":"39-104"},"PeriodicalIF":1.4,"publicationDate":"2017-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4267/2042/62267","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47571821","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}
J. Moreno-Bedmar, E. Robert, R. Matamales‐Andreu, T. Bover‐Arnal
In this work, we review the ammonites of the Montmell Formation in the Marmellar area housed in the collections of the Museo Geologico del Seminario de Barcelona and the Museu de Geologia de Barcelona. This taxonomic update allows the proper biostratigraphic analysis of the ammonite assemblage and assigns it to the early Albian, Leymeriella tardefurcata Zone. The taxonomic analysis of all the studied material allows us to recognize the presence of the following taxa: Uhligella sp., Parengonoceras bassei, Hypacanthoplites plesiotypicus, Hypacanthoplites milletianus, Hypacanthoplites subelegans, and Hypacanthoplites sp. The current work is a step forward in the chronostratigraphic knowledge of the Salou-Garraf Basin in the Catalan Coastal Ranges.
{"title":"Review of the early Albian ammonites of the Montmell Formation near Marmellar (Salou-Garraf Basin, Tarragona, Catalonia, Spain)","authors":"J. Moreno-Bedmar, E. Robert, R. Matamales‐Andreu, T. Bover‐Arnal","doi":"10.4267/2042/62038","DOIUrl":"https://doi.org/10.4267/2042/62038","url":null,"abstract":"In this work, we review the ammonites of the Montmell Formation in the Marmellar area housed in the collections of the Museo Geologico del Seminario de Barcelona and the Museu de Geologia de Barcelona. This taxonomic update allows the proper biostratigraphic analysis of the ammonite assemblage and assigns it to the early Albian, Leymeriella tardefurcata Zone. The taxonomic analysis of all the studied material allows us to recognize the presence of the following taxa: Uhligella sp., Parengonoceras bassei, Hypacanthoplites plesiotypicus, Hypacanthoplites milletianus, Hypacanthoplites subelegans, and Hypacanthoplites sp. The current work is a step forward in the chronostratigraphic knowledge of the Salou-Garraf Basin in the Catalan Coastal Ranges.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"17 1","pages":"1-10"},"PeriodicalIF":1.4,"publicationDate":"2017-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4267/2042/62038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44043973","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. Székely, Raluca Bindiu-Haitonic, S. Filipescu, Răzvan-Ionuț Bercea
Planktonic and benthic foraminiferal assemblages were used for biostratigraphy and paleoenvironmental reconstruction of the marine lower Miocene Chechiș Formation from the Gălpâia section (Sălaj county, Romania) in the northwestern Transylvanian Basin. Planktonic foraminifera suggest an Eggenburgian (Burdigalian) age for the deposits studied and reveal episodes of high primary productivity and mostly cool surface waters. Benthic foraminiferal assemblages indicate paleoenvironmental deepening from outer shelf to upper bathyal settings. Deltaic influences may be observed at the base of the studied section in outer shelf (possibly upper bathyal) environments with oxygenated bottom water and episodic high primary productivity, as a consequence of nutrient input from the land. Changes in paleobathymetry resulted in reduction of primary productivity. The benthic assemblages from the uppermost part of the section are dominated by tubular agglutinated foraminifera and indicate an upper bathyal setting with low organic flux to the sea floor. The sediments of the studied section were deposited during the late stage of the first early Miocene relative sea-level rise in the Transylvanian Basin.
{"title":"Biostratigraphy and paleoenvironmental reconstruction of the marine lower Miocene Chechiș Formation in the Transylvanian Basin based on foraminiferal assemblages","authors":"S. Székely, Raluca Bindiu-Haitonic, S. Filipescu, Răzvan-Ionuț Bercea","doi":"10.4267/2042/62041","DOIUrl":"https://doi.org/10.4267/2042/62041","url":null,"abstract":"Planktonic and benthic foraminiferal assemblages were used for biostratigraphy and paleoenvironmental reconstruction of the marine lower Miocene Chechiș Formation from the Gălpâia section (Sălaj county, Romania) in the northwestern Transylvanian Basin. Planktonic foraminifera suggest an Eggenburgian (Burdigalian) age for the deposits studied and reveal episodes of high primary productivity and mostly cool surface waters. Benthic foraminiferal assemblages indicate paleoenvironmental deepening from outer shelf to upper bathyal settings. Deltaic influences may be observed at the base of the studied section in outer shelf (possibly upper bathyal) environments with oxygenated bottom water and episodic high primary productivity, as a consequence of nutrient input from the land. Changes in paleobathymetry resulted in reduction of primary productivity. The benthic assemblages from the uppermost part of the section are dominated by tubular agglutinated foraminifera and indicate an upper bathyal setting with low organic flux to the sea floor. The sediments of the studied section were deposited during the late stage of the first early Miocene relative sea-level rise in the Transylvanian Basin.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"17 1","pages":"11-37"},"PeriodicalIF":1.4,"publicationDate":"2017-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4267/2042/62041","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44355736","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}
M. Yavari, M. Yazdi, Hormoz Gahalavand, H. K. Shadan, M. Adabi, L. Villier
Two species of spatangoid echinoid belonging to Heteraster Orbigny, 1853, are described from Lower Cretaceous deposits (Gadvan and Dariyan formations) at the Kuh-e Gadvan and Banesh sections situated in Zagros Mountains, south of Iran. Heteraster couloni (Agassiz, 1839) is confirmed in the Barremian and Heteraster delgadoi (Loriol, 1884) in the late Aptian-Albian of Iran. The occurrences of Heteraster and other spatangoid echinoids in Iran show a clear distinction between assemblages from the southern and northern margins of the Tethys during the Early Cretaceous.
{"title":"Early Cretaceous Toxasterid Echinoid Heteraster from the high Zagros basin, south of Iran","authors":"M. Yavari, M. Yazdi, Hormoz Gahalavand, H. K. Shadan, M. Adabi, L. Villier","doi":"10.4267/2042/61883","DOIUrl":"https://doi.org/10.4267/2042/61883","url":null,"abstract":"Two species of spatangoid echinoid belonging to Heteraster Orbigny, 1853, are described from Lower Cretaceous deposits (Gadvan and Dariyan formations) at the Kuh-e Gadvan and Banesh sections situated in Zagros Mountains, south of Iran. Heteraster couloni (Agassiz, 1839) is confirmed in the Barremian and Heteraster delgadoi (Loriol, 1884) in the late Aptian-Albian of Iran. The occurrences of Heteraster and other spatangoid echinoids in Iran show a clear distinction between assemblages from the southern and northern margins of the Tethys during the Early Cretaceous.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"16 1","pages":"615-632"},"PeriodicalIF":1.4,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4267/2042/61883","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70514138","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}
The material under study has previously been identified as Lingula krausei, collected from glacial erratics at Cape Rozewie, Poland. All specimens come from glauconitic sandstone of Cenomanian age. Dames (1874) identified his Lingula sp. as L. krausei which differs in shell outline from Lingula truncata. This species, dedicated to A. Krause, together with L. subovalis, is considered characteristic of the Cenomanian. Several new species and genera have recently been described or redescribed and compared to our specimens, here identified as Lingularia similis. By priority (ICZN, 1999), the type species L. similis is currently synonymized with Lingula krausei. A new genus Eolingularia, within the Family Lingulidae, is here described, with Lingularia siberica Biernat et Emig, 1993, as type species. This new genus ranges from the Carboniferous to the Triassic in Russia, China, and Spain. Possible synonymies are discussed.
{"title":"On the type species of Lingularia, and description of Eolingularia n. gen.","authors":"M. Bitner, C. Emig","doi":"10.4267/2042/56006","DOIUrl":"https://doi.org/10.4267/2042/56006","url":null,"abstract":"The material under study has previously been identified as Lingula krausei, collected from glacial erratics at Cape Rozewie, Poland. All specimens come from glauconitic sandstone of Cenomanian age. Dames (1874) identified his Lingula sp. as L. krausei which differs in shell outline from Lingula truncata. This species, dedicated to A. Krause, together with L. subovalis, is considered characteristic of the Cenomanian. Several new species and genera have recently been described or redescribed and compared to our specimens, here identified as Lingularia similis. By priority (ICZN, 1999), the type species L. similis is currently synonymized with Lingula krausei. A new genus Eolingularia, within the Family Lingulidae, is here described, with Lingularia siberica Biernat et Emig, 1993, as type species. This new genus ranges from the Carboniferous to the Triassic in Russia, China, and Spain. Possible synonymies are discussed.","PeriodicalId":55273,"journal":{"name":"Carnets De Geologie","volume":"16 1","pages":"543-555"},"PeriodicalIF":1.4,"publicationDate":"2016-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70510517","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}
Hanen Belghithi, F. Boulvain, C. Yaich, Anne-Sophie da Silva
En Tunisie, au cours du Miocene, suite a la phase de plissement NE-SW (direction atlasique), les depots silicoclastiques sont mis en place dans un environnement deltaique au sud-ouest et une plate-forme marine interne au nord-est du pays. Dans cet article, nous presentons la coupe de Kechem El Artsouma, du Miocene, qui est representative des depots de Tunisie centrale. Cette zone est particulierement interessante car elle correspond a la zone de transition entre les depots de delta et marins peu profonds. Nous proposons une combinaison de techniques telles que l'analyse des facies, la susceptibilite magnetique et la mesure de la teneur en carbonate pour ameliorer l'interpretation et la reconstruction des paleo-environnements et de leur evolution au cours du Miocene. Huit facies sont identifies, situes dans un domaine fluviatile, lagunaire et un domaine de plage. Les depots de la Formation Ain Grab (Langhien) sont interpretes comme deposes en phase transgressive, suivis par les depots de la Formation de Beglia (Serravallien) en phase regressive. La Formation de Saouaf (Serravallien-Tortonien inferieur) correspond a une phase transgressive et regressive. La coupe Kechem El Artsouma permet de proposer un modele sedimentaire pour les depots du Miocene de la zone de transition en Tunisie centrale.
在突尼斯，中新世，在NE-SW褶皱阶段(atlasic方向)之后，硅碎屑沉积在西南部的三角洲环境和东北部的内部海洋平台中形成。在这篇文章中，我们介绍了中新世的Kechem El Artsouma杯，它代表了突尼斯中部的沉积物。这个区域特别有趣，因为它对应于三角洲和浅海沉积物之间的过渡区域。我们提出了相分析、磁化率和碳酸盐含量测量等技术的结合，以改进对中新世古环境及其演化的解释和重建。确定了八个相，分别位于河流区、泻湖区和海滩区。Ain Grab组(Langhien)的沉积物被解释为海侵相，其次是Beglia组(Serravallien)的沉积物。Saouaf(下serravallian - tortonian)的形成对应着一个海侵和倒退阶段。Kechem El Artsouma杯为突尼斯中部过渡地带的中新世沉积提供了一个沉积模型。
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