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Luc Georges Bulot

Université de Bretagne Occidentale, Geosciences Ocean, Faculty Member

The University of Manchester, School of Earth and Environmental Sciences, Research Fellow and Visiting Academic

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Luc Georges Bulot is a Senior Research Fellow (CNRS) since 1998. He is affiliated to the Geoscience Ocean Lab (Brest University, CNRS/Ifremer/UBO France) and is also Research Fellow at the University of Manchester since 2017 (North Africa Research Group, Dept of Earth and Environmental Sciences).

He graduated from Dijon University, France, with an MSc in 1990, and from the National Museum of Natural History in Paris, with a Ph.D. in 1995.

His career started as a Consultant for Lagoven SA in Venezuela, and then as an Assistant Lecturer at Grenoble University, France. He was then appointed a CNRS fellow based at Aix-Marseille University until March 2021.

Since 1995, he acted as chairperson and/or regional coordinator for various Lower Cretaceous Working Groups of the International Subcommission of Cretaceous Stratigraphy (ISCS/IUGS).

His current research interest covers the Mesozoic of the Middle East, Northern Africa, and South America.

He currently leads the Biostratigraphy team of the North Africa Research Group, and co-leads with Daniel Aslanian and Marina Robineau (LCO/Ifremer/CNRS, Brest, France), a project on Ammonite palaeobiogeography vs. plate kinematics and sedimentary flux.

His publications record includes over 100 papers on Jurassic and Cretaceous ammonite taxonomy, biostratigraphy and paleoecology, as well as many contributions on high resolution integrated stratigraphy.

He is also an Associate Editor of the Arabian Journal of Geosciences (AJGS).

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Papers by Luc Georges Bulot

First unequivocal occurrence of the genus Douvilleiceras (Douvilleiceratoidea, Ancyloceratina) in the Albian of Sinai (Egypt)

Mediterranean Geoscience Reviews

Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sin... more Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sinai), the occurrence of the cosmopolitan Albian genus Douvilleiceras is unequivocally documented for the first time in Egypt. Douvilleiceras orbignyi, a species known to characterise the middle to uppermost lower Albian of Western Europe, is identified. The taxonomy, palaeogeography and population dynamics of the hypernodose forms of Douvilleiceras, e.g. the &quot;aequinodum&quot; group of the literature are discussed.

Berriasian ammonites of supposed Tethyan origin from the type ‘Ryazanian’, Russia: a systematic re-interpretation

Palaeoworld

The proposal of a GSSP for the Berriasian Stage (Cretaceous System): Part 2

Volumina Jurassica

Ammonite stratigraphy and the belemnite genus Hibolithes in the higher Serdj Formation (Aptian-Albian boundary interval) in north central Tunisia

Zeitschrift der Deutschen Gesellschaft für Geowissenschaften

Deep sea rock record exhumed on oceanic volcanic islands: the Cretaceous sediments of Maio, Cape Verde

Gondwana Research

The Aptian GSSP candidate at Gorgo a Cerbara (Central Italy): an alternative interpretation of the bio-, litho- and chemostratigraphic markers

Newsletters on Stratigraphy

The Maiolica-type Gorgo a Cerbara section (Central Italy) was proposed as GSSP candidate for defi... more The Maiolica-type Gorgo a Cerbara section (Central Italy) was proposed as GSSP candidate for defining the base of the Aptian Stage with the base of the reverse magnetochron CM0r as the primary datum. Comparison with well-documented, ammonite-bearing successions of southeast France shows that the bio-, litho- and chemostratigraphic events recorded in Italy, below, at, and above this magnetochron fall within the Martelites sarasini ammonite Zone. Since there is an agreement that the M. sarasini Zone is the last ammonite zone of the Barremian, the use of the base of magnetozone CM0r as a datum to define the Barremian/Aptian boundary is questioned.

A revised ammonoid biostratigraphy for the Aptian of NW Africa: Essaouira-Agadir Basin, Morocco

Cretaceous Research

Abstract A revised ammonoid biostratigraphy is presented for the Aptian of NW Africa, Essaouira-A... more Abstract A revised ammonoid biostratigraphy is presented for the Aptian of NW Africa, Essaouira-Agadir Basin (EAB), Morocco, based on detailed analysis of 5 key sections. A number of bio-events are documented and 26 genus and 43 species fully documented, forming the largest published Aptian ammonite collection made from NW Africa. The section at Tiskatine is documented as the type section, and 8 zones and subzones are defined, of which 5 are new. This work allows correlation of the Aptian of the EAB to the Standard Mediterranean Ammonite Scale (SMAS). Two main hiatuses are identified at the scale of the basin scale: a major one that includes most of the lower Aptian and the base of the upper Aptian and a second one encompass the top of the upper Aptian and the base of the lower Albian. The ammonite fauna displays a clear Tethyan palaeobiogeographic character affected by a fairly high degree of endemism at the genus and species level. The new genus and species Elsaisabellia tiskatinensis is introduced.

Upper Tithonian ammonites (Himalayitidae Spath, 1925 and Neocomitidae Salfeld, 1921) from Charens (Drôme, France)

Geologica Carpathica, 2016

This contribution focuses on the Perisphinctoidea ammonite taxa from the Upper Tithonian at Chare... more This contribution focuses on the Perisphinctoidea ammonite taxa from the Upper Tithonian at Charens (Drôme, south-east France). Emphasis is laid on five genera that belong to the families Himalayitidae and Neocomitidae. We document the precise vertical range of the index-species Micracanthoceras microcanthum, and a comparative ontogenetic- biometric analysis sheds new light on its range of variation and dimorphism as compared to the bestknown Spanish populations. As herein understood, the lower boundary of the M. microcanthum Zone (base of the Upper Tithonian) is fixed at the FAD of its index species. The faunal assemblages and species distribution of the P. andreaei Zone are rather similar to those described at the key-section of Le Chouet as confirmed by the co-occurrence of the genera Protacanthodiscus, Boughdiriella and Pratumidiscus. New palaeontological evidence supports the view that the basal Neocomitidae Busnardoiceras busnardoi was derived from Protacanthodiscus andreaei i...

Systematic palaeontology of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France), and its implications for biostratigraphy

Acta Geologica Polonica, 2016

This study describes ammonite taxa of the Perisphinctoidea in the Jurassic/Cretaceous boundary in... more This study describes ammonite taxa of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France). Emphasis is placed on new and poorly known Himalayitidae, Neocomitidae and Olcostephanidae from the lower part of the Jacobi Zone auctorum. Significant results relate the introduction of Lopeziceras gen. nov., grouping himalayitid-like forms with two rows of tubercles, and Praedalmasiceras gen. nov., grouping the early Berriasian Dalmasiceras taxa. Study of the ontogenetic sequences of both genera show that they were derived from late Tithonian Himalayitidae. This supports the distinction between the subfamilies Himalayitinae and Dalmasiceratidae subfam. nov. Content, variation, dimorphism and vertical range of the Neocomitidae Berriasella, Pseudoneocomites, Elenaella and Delphinella are discussed. A conservative use of the Olcostephanidae Proniceras is followed herein.

Revision of the ammonite index species Berriasella jacobi Mazenot, 1939 and its consequences for the biostratigraphy of the Berriasian Stage

Cretaceous Research, 2016

Abstract Berriasella jacobi is a key ammonite taxon that has been widely used for the definition ... more Abstract Berriasella jacobi is a key ammonite taxon that has been widely used for the definition of the Tithonian/Berriasian boundary and has been widely quoted in the literature as the index species for the lowest zone of the Berriasian Stage. The taxonomic revision of B. jacobi shows that it should be excluded from the genus Berriasella and transferred to the genus Strambergella. Analysis of the literature has convinced us that most specimens illustrated as B. jacobi have been misidentified. New collection at Le Font de Saint Bertrand (Les Combes, Glandage, Drome, France) shows us the type series corresponds to the microconch form of a dimorphic pair. New integrated data on its stratigraphic distribution causes us to question its value as an index species for the base of the Berriasian.

The Paleoecology, Habitats, and Stratigraphic Range of the Enigmatic Cretaceous Brachiopod Peregrinella

PLoS ONE, 2014

Depositional sequences, diagenesis and structural control of the Albian to Turonian carbonate platform systems in coastal Fars (SW Iran)

Marine and Petroleum Geology, 2015

First unequivocal occurrence of the genus Douvilleiceras (Douvilleiceratoidea, Ancyloceratina) in the Albian of Sinai (Egypt

First unequivocal occurrence of the genus Douvilleiceras, 2022

Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sin... more Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sinai), the occurrence of the cosmopolitan Albian genus Douvilleiceras is unequivocally documented for the first time in Egypt. Douvilleiceras orbignyi, a species known to characterise the middle to uppermost lower Albian of Western Europe, is identified. The taxonomy, palaeogeography and population dynamics of the hypernodose forms of Douvilleiceras, e.g. the "aequinodum" group of the literature are discussed.

Back to the Field: The Limits of Standard Scales in High-Resolution Stratigraphy. Examples from Northwest Africa and the Middle East

Recent Research on Geomorphology, Sedimentology, Marine Geosciences and Geochemistry

Carbon-isotope stratigraphy, biostratigraphy and organic matter distribution in the Aptian - Lower Albian successions of southwest Iran (Dariyan and Kazhdumi formations)

The lateral transition from carbonate platforms to intra-shelf basin in Aptian – Early Albian tim... more The lateral transition from carbonate platforms to intra-shelf basin in Aptian – Early Albian times is documented along a regional transect in the excellent exposures of the Zagros Mountains. An integrated dataset, including carbonate carbon-isotope curves, and ammonite and planktonic foraminifera biostratigraphy constrains the regional correlations, and forms the basis for an age revision of the Kazhdumi and Dariyan formations. Of particular importance in this study is the Kuh-e-Bangestan section, wherein a continuous succession of Aptian – Albian intra-shelf basinal deposits was used to erect a detailed ammonite and planktonic foraminifera biostratigraphic zonation scheme, in combination with a carbon-isotope curve and organic-matter measurements. Key observations are: (1) the oldest Kazhdumi intra-shelf deposits are of Early Aptian age (D. deshayesi Zone), indicating a timeequivalent initiation of the Kazhdumi and neighbouring intra-shelf Bab Basin. (2) The presence of well-devel...

Controls and timing of Cenomanian-Turonian organic enrichment and relationship to the OAE2 event in Morocco, North Africa

Marine and Petroleum Geology, 2021

The Cenomanian-Turonian Oceanic Anoxic Event (OAE2) is a significant global event that has been l... more The Cenomanian-Turonian Oceanic Anoxic Event (OAE2) is a significant global event that has been linked to major source rock development in marine environments. The aim of this study is to integrate biostratigraphic, sedimentological and geochemical data (including stable carbon isotopes and trace elements) to document the timing and controls of organic matter enrichment across the Cenomanian-Turonian boundary. Morocco has excellent exposures of Tethyan carbonate platform and basinal facies and this paper details a high-resolution analysis of organic-rich Late Cretaceous intervals exposed in the Errachidia-Goulmima Basin, to investigate their relationship to the OAE2. Integrating planktic foraminiferal and ammonite biostratigraphy with carbon isotope correlations indicate that organic-rich black mudstones identified were deposited from latest Cenomanian to early Turonian, suggesting a late-OAE2 to post-OAE2 age. The sedimentology, redox water conditions and palaeoproductivity of the ...

Jurassic Carbonate Platforms along the Central Atlantic Margin - Unlocking the Sedimentological and Diagenetic Controls on Reservoir Development

Mesozoic carbonates deposited along the Central Atlantic Margin are important, if challenging, ex... more Mesozoic carbonates deposited along the Central Atlantic Margin are important, if challenging, exploration targets. These Middle to Upper Jurassic carbonates have demonstrated reservoir potential, but the key to reduce risk and improve success rates is to better understand facies distribution and evolution of the system and later diagenetic controls on reservoir development. Success to-date has been mixed, with a number of non-commercial discoveries, such as Cap Juby in the Tarfaya Basin, southern Morocco and one significant producing field, the Panuke gas field in Nova Scotia, Canada.

Stratigraphy of the Western "Celica Basin" (SW Ecuador)

La série apto-albienne du bassin marginal de Tarfaya (Maroc méridional)

Comparative evolution of the Lower Cretaceous pluto-volcanic arc and back-arc from the Atacama Region, Chile

C. Arevalo , F. A. Mourgues , E. Jaillard , & L. G. Bulot 4 Servicio Nacional de Geologia y Miner... more C. Arevalo , F. A. Mourgues , E. Jaillard , & L. G. Bulot 4 Servicio Nacional de Geologia y Mineria, Av. Santa Maria 0104, Providencia. Chile; carevalo@sernageomin.cl 2 IRD – LMTG, Observatoir Midi-Pyrenees, 14, Avenue Edouard Belin. 31400, Toulouse, France 3 IRD – LGCA, Maison des Geosciences, BP 53, 38 041 Grenoble Cedex 9, France 4 FRE CNRS 2761,Centre de Sedimentologie-Paleontologie,U.de Provence,F-13331 Marseille cedex 03, France

First unequivocal occurrence of the genus Douvilleiceras (Douvilleiceratoidea, Ancyloceratina) in the Albian of Sinai (Egypt)

Mediterranean Geoscience Reviews

Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sin... more Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sinai), the occurrence of the cosmopolitan Albian genus Douvilleiceras is unequivocally documented for the first time in Egypt. Douvilleiceras orbignyi, a species known to characterise the middle to uppermost lower Albian of Western Europe, is identified. The taxonomy, palaeogeography and population dynamics of the hypernodose forms of Douvilleiceras, e.g. the &quot;aequinodum&quot; group of the literature are discussed.

Berriasian ammonites of supposed Tethyan origin from the type ‘Ryazanian’, Russia: a systematic re-interpretation

Palaeoworld

The proposal of a GSSP for the Berriasian Stage (Cretaceous System): Part 2

Volumina Jurassica

Ammonite stratigraphy and the belemnite genus Hibolithes in the higher Serdj Formation (Aptian-Albian boundary interval) in north central Tunisia

Zeitschrift der Deutschen Gesellschaft für Geowissenschaften

Deep sea rock record exhumed on oceanic volcanic islands: the Cretaceous sediments of Maio, Cape Verde

Gondwana Research

The Aptian GSSP candidate at Gorgo a Cerbara (Central Italy): an alternative interpretation of the bio-, litho- and chemostratigraphic markers

Newsletters on Stratigraphy

The Maiolica-type Gorgo a Cerbara section (Central Italy) was proposed as GSSP candidate for defi... more The Maiolica-type Gorgo a Cerbara section (Central Italy) was proposed as GSSP candidate for defining the base of the Aptian Stage with the base of the reverse magnetochron CM0r as the primary datum. Comparison with well-documented, ammonite-bearing successions of southeast France shows that the bio-, litho- and chemostratigraphic events recorded in Italy, below, at, and above this magnetochron fall within the Martelites sarasini ammonite Zone. Since there is an agreement that the M. sarasini Zone is the last ammonite zone of the Barremian, the use of the base of magnetozone CM0r as a datum to define the Barremian/Aptian boundary is questioned.

A revised ammonoid biostratigraphy for the Aptian of NW Africa: Essaouira-Agadir Basin, Morocco

Cretaceous Research

Abstract A revised ammonoid biostratigraphy is presented for the Aptian of NW Africa, Essaouira-A... more Abstract A revised ammonoid biostratigraphy is presented for the Aptian of NW Africa, Essaouira-Agadir Basin (EAB), Morocco, based on detailed analysis of 5 key sections. A number of bio-events are documented and 26 genus and 43 species fully documented, forming the largest published Aptian ammonite collection made from NW Africa. The section at Tiskatine is documented as the type section, and 8 zones and subzones are defined, of which 5 are new. This work allows correlation of the Aptian of the EAB to the Standard Mediterranean Ammonite Scale (SMAS). Two main hiatuses are identified at the scale of the basin scale: a major one that includes most of the lower Aptian and the base of the upper Aptian and a second one encompass the top of the upper Aptian and the base of the lower Albian. The ammonite fauna displays a clear Tethyan palaeobiogeographic character affected by a fairly high degree of endemism at the genus and species level. The new genus and species Elsaisabellia tiskatinensis is introduced.

Upper Tithonian ammonites (Himalayitidae Spath, 1925 and Neocomitidae Salfeld, 1921) from Charens (Drôme, France)

Geologica Carpathica, 2016

This contribution focuses on the Perisphinctoidea ammonite taxa from the Upper Tithonian at Chare... more This contribution focuses on the Perisphinctoidea ammonite taxa from the Upper Tithonian at Charens (Drôme, south-east France). Emphasis is laid on five genera that belong to the families Himalayitidae and Neocomitidae. We document the precise vertical range of the index-species Micracanthoceras microcanthum, and a comparative ontogenetic- biometric analysis sheds new light on its range of variation and dimorphism as compared to the bestknown Spanish populations. As herein understood, the lower boundary of the M. microcanthum Zone (base of the Upper Tithonian) is fixed at the FAD of its index species. The faunal assemblages and species distribution of the P. andreaei Zone are rather similar to those described at the key-section of Le Chouet as confirmed by the co-occurrence of the genera Protacanthodiscus, Boughdiriella and Pratumidiscus. New palaeontological evidence supports the view that the basal Neocomitidae Busnardoiceras busnardoi was derived from Protacanthodiscus andreaei i...

Systematic palaeontology of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France), and its implications for biostratigraphy

Acta Geologica Polonica, 2016

This study describes ammonite taxa of the Perisphinctoidea in the Jurassic/Cretaceous boundary in... more This study describes ammonite taxa of the Perisphinctoidea in the Jurassic/Cretaceous boundary interval at Le Chouet (Drôme, France). Emphasis is placed on new and poorly known Himalayitidae, Neocomitidae and Olcostephanidae from the lower part of the Jacobi Zone auctorum. Significant results relate the introduction of Lopeziceras gen. nov., grouping himalayitid-like forms with two rows of tubercles, and Praedalmasiceras gen. nov., grouping the early Berriasian Dalmasiceras taxa. Study of the ontogenetic sequences of both genera show that they were derived from late Tithonian Himalayitidae. This supports the distinction between the subfamilies Himalayitinae and Dalmasiceratidae subfam. nov. Content, variation, dimorphism and vertical range of the Neocomitidae Berriasella, Pseudoneocomites, Elenaella and Delphinella are discussed. A conservative use of the Olcostephanidae Proniceras is followed herein.

Revision of the ammonite index species Berriasella jacobi Mazenot, 1939 and its consequences for the biostratigraphy of the Berriasian Stage

Cretaceous Research, 2016

Abstract Berriasella jacobi is a key ammonite taxon that has been widely used for the definition ... more Abstract Berriasella jacobi is a key ammonite taxon that has been widely used for the definition of the Tithonian/Berriasian boundary and has been widely quoted in the literature as the index species for the lowest zone of the Berriasian Stage. The taxonomic revision of B. jacobi shows that it should be excluded from the genus Berriasella and transferred to the genus Strambergella. Analysis of the literature has convinced us that most specimens illustrated as B. jacobi have been misidentified. New collection at Le Font de Saint Bertrand (Les Combes, Glandage, Drome, France) shows us the type series corresponds to the microconch form of a dimorphic pair. New integrated data on its stratigraphic distribution causes us to question its value as an index species for the base of the Berriasian.

The Paleoecology, Habitats, and Stratigraphic Range of the Enigmatic Cretaceous Brachiopod Peregrinella

PLoS ONE, 2014

Depositional sequences, diagenesis and structural control of the Albian to Turonian carbonate platform systems in coastal Fars (SW Iran)

Marine and Petroleum Geology, 2015

First unequivocal occurrence of the genus Douvilleiceras (Douvilleiceratoidea, Ancyloceratina) in the Albian of Sinai (Egypt

First unequivocal occurrence of the genus Douvilleiceras, 2022

Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sin... more Based on new material collected from the Risan Aneiza Formation at Gabal Maaza (Maghara area, Sinai), the occurrence of the cosmopolitan Albian genus Douvilleiceras is unequivocally documented for the first time in Egypt. Douvilleiceras orbignyi, a species known to characterise the middle to uppermost lower Albian of Western Europe, is identified. The taxonomy, palaeogeography and population dynamics of the hypernodose forms of Douvilleiceras, e.g. the "aequinodum" group of the literature are discussed.

Back to the Field: The Limits of Standard Scales in High-Resolution Stratigraphy. Examples from Northwest Africa and the Middle East

Recent Research on Geomorphology, Sedimentology, Marine Geosciences and Geochemistry

Carbon-isotope stratigraphy, biostratigraphy and organic matter distribution in the Aptian - Lower Albian successions of southwest Iran (Dariyan and Kazhdumi formations)

The lateral transition from carbonate platforms to intra-shelf basin in Aptian – Early Albian tim... more The lateral transition from carbonate platforms to intra-shelf basin in Aptian – Early Albian times is documented along a regional transect in the excellent exposures of the Zagros Mountains. An integrated dataset, including carbonate carbon-isotope curves, and ammonite and planktonic foraminifera biostratigraphy constrains the regional correlations, and forms the basis for an age revision of the Kazhdumi and Dariyan formations. Of particular importance in this study is the Kuh-e-Bangestan section, wherein a continuous succession of Aptian – Albian intra-shelf basinal deposits was used to erect a detailed ammonite and planktonic foraminifera biostratigraphic zonation scheme, in combination with a carbon-isotope curve and organic-matter measurements. Key observations are: (1) the oldest Kazhdumi intra-shelf deposits are of Early Aptian age (D. deshayesi Zone), indicating a timeequivalent initiation of the Kazhdumi and neighbouring intra-shelf Bab Basin. (2) The presence of well-devel...

Controls and timing of Cenomanian-Turonian organic enrichment and relationship to the OAE2 event in Morocco, North Africa

Marine and Petroleum Geology, 2021

The Cenomanian-Turonian Oceanic Anoxic Event (OAE2) is a significant global event that has been l... more The Cenomanian-Turonian Oceanic Anoxic Event (OAE2) is a significant global event that has been linked to major source rock development in marine environments. The aim of this study is to integrate biostratigraphic, sedimentological and geochemical data (including stable carbon isotopes and trace elements) to document the timing and controls of organic matter enrichment across the Cenomanian-Turonian boundary. Morocco has excellent exposures of Tethyan carbonate platform and basinal facies and this paper details a high-resolution analysis of organic-rich Late Cretaceous intervals exposed in the Errachidia-Goulmima Basin, to investigate their relationship to the OAE2. Integrating planktic foraminiferal and ammonite biostratigraphy with carbon isotope correlations indicate that organic-rich black mudstones identified were deposited from latest Cenomanian to early Turonian, suggesting a late-OAE2 to post-OAE2 age. The sedimentology, redox water conditions and palaeoproductivity of the ...

Jurassic Carbonate Platforms along the Central Atlantic Margin - Unlocking the Sedimentological and Diagenetic Controls on Reservoir Development

Mesozoic carbonates deposited along the Central Atlantic Margin are important, if challenging, ex... more Mesozoic carbonates deposited along the Central Atlantic Margin are important, if challenging, exploration targets. These Middle to Upper Jurassic carbonates have demonstrated reservoir potential, but the key to reduce risk and improve success rates is to better understand facies distribution and evolution of the system and later diagenetic controls on reservoir development. Success to-date has been mixed, with a number of non-commercial discoveries, such as Cap Juby in the Tarfaya Basin, southern Morocco and one significant producing field, the Panuke gas field in Nova Scotia, Canada.

Stratigraphy of the Western "Celica Basin" (SW Ecuador)

La série apto-albienne du bassin marginal de Tarfaya (Maroc méridional)

Comparative evolution of the Lower Cretaceous pluto-volcanic arc and back-arc from the Atacama Region, Chile

C. Arevalo , F. A. Mourgues , E. Jaillard , & L. G. Bulot 4 Servicio Nacional de Geologia y Miner... more C. Arevalo , F. A. Mourgues , E. Jaillard , & L. G. Bulot 4 Servicio Nacional de Geologia y Mineria, Av. Santa Maria 0104, Providencia. Chile; carevalo@sernageomin.cl 2 IRD – LMTG, Observatoir Midi-Pyrenees, 14, Avenue Edouard Belin. 31400, Toulouse, France 3 IRD – LGCA, Maison des Geosciences, BP 53, 38 041 Grenoble Cedex 9, France 4 FRE CNRS 2761,Centre de Sedimentologie-Paleontologie,U.de Provence,F-13331 Marseille cedex 03, France

Berriasian ammonites of supposed Tethyan origin from the type 'Ryazanian', Russia: a systematic re-interpretation

Palaeoworld, 2020

For more than a century, a number of ammonite taxa of supposed Tethyan origin or affinity have be... more For more than a century, a number of ammonite taxa of supposed Tethyan origin or affinity have been reported from the Berriasian condensed deposits of Russia (referred to as 'Ryazanian'). These occurrences have been used to constrain long-distance correlation and palaeobiogeo-graphic interpretation of the Russian Platform during the earliest Cretaceous. We revise these taxa herein. To accommodate the systematic issues, we introduce a new ammonite genus: Mittaites n. gen. (type species: Mazenoticeras ceccai). We also provide re-assessment for the genera Tauri-coceras (= Subriasanites), Riasanella, Riasanites, Prorjasanites, and Karasyazites. Considering the strong affinities between these genera (except for Karasyazites), resctricted palaeobiogeographic distribution and a problematic phyletic origin, we erect a new family Riasanitidae n. fam. Our re-examination suggests that the occurrence of western Tethyan migrants in the type 'Ryazanian' should be ruled out. Pending new investigation, correlation of the ammonites of the type 'Ryazanian' beds with the Berriasian part of the Standard Mediterranean Ammonite Scale (SMAS) should be treated with caution.

Late Middle–early Late Albian ammonites from Ecuador

by Emmanuel Robert and Luc Georges Bulot

Cretaceous Research, 2005

Ammonites of the Albian genera Brancoceras, Dipoloceras, Mortoniceratoides and Neophlycticeras ar... more Ammonites of the Albian genera Brancoceras, Dipoloceras, Mortoniceratoides and Neophlycticeras are described and illustrated for the first time from Ecuador. Precise stratigraphic distribution in the Rio Misahuali field section allows delineation of the Middle/Upper Albian boundary in the Oriente of Ecuador through the recognition of the Dipoloceras cristatum Zone.

La transgresión del Cretáceo Inferior en el margen andino (Perú y Ecuador): Datos preliminares

by Emmanuel Robert and Luc Georges Bulot

Boletin de la Sociedad Geologica del Peru, 1998

... Auteurs, Robert E., Bulot LG, Dhondt A., Jaillard Etienne, Villagomez R., Rivadeneira M., Paz... more

Revision bioestratigrafica del Albiano inferior a superior basal en la Cuenca Andina (Peru Central y Norte)

by Emmanuel Robert and Luc Georges Bulot

Boletin de la Sociedad Geologica del Peru, 2003

Albian Ammonite Faunas from Peru: The Genus Neodeshayesites Casey, 1964

by Emmanuel Robert and Luc Georges Bulot

Journal of Paleontology, 2005

Proposition d'une nouvelle biozonation par ammonites de l'Albien du Bassin andin (Pérou)

by Emmanuel Robert and Luc Georges Bulot

Comptes Rendus Palevol, 2002

albian ammonite faunas from south america: the genus Tegoceras Hyatt, 1903

by Emmanuel Robert, Jean-Louis LATIL, and Luc Georges Bulot

Revue de Paléobiologie, 2009

La transgresion albiana en la Cuenca Andina (Peru Central - Ecuador): modelo general y diacronismo de los depositos marinos

by Emmanuel Robert and Luc Georges Bulot

Boletin de la Sociedad Geologica del Peru, 2002

Revision estratigrafica del cretaceo superior del Noroeste peruano y Suroeste ecuatoriano: datos preliminares, consecuencias tectonicas

by Emmanuel Robert and Luc Georges Bulot

Boletin de la Sociedad Geologica del Peru, 1998

Caractérisation d'une nouvelle sous-zone d'ammonites au passage Aptien-Albien dans les 'Marnes noires a Hypacanthoplites' des Pyrénées espagnoles

by Emmanuel Robert and Luc Georges Bulot

Géobios, 2001