Emmanuel Robert

French National Centre for Scientific Research | CNRS · LGLTPE

A taxonomic study was carried out of 34 ammonites collected from the Agua Salada and Nogal formations (Lampazos Group) and the Mural Limestone (Bisbee Group) in the Sonora State, northwest of Mexico. Twenty-one taxa are described, with 13 being endemic of the Central Atlantic province: Puzosia (Anapuzosia) sp. juv. cf. tucuyensis, Parasilesites cf....

The Barremian-Aptian interval is considered a turning point in the extensional evolution of the passive Atlantic margin of Morocco. The biostratigraphy and sedimentology study of the coarse-grained clastic deposits of the Essaouira-Agadir Basin (Bouzergoun Fm) indicates that they are entirely late Barremian (Sartousiana p.p. to Sarasini p.p. Zones)...

In this paper, we present an updated biostratigraphic evaluation of the Serdj Formation of the Tunisian Atlas. Newly collected ammonites, combined with available biostratigraphic data, allowed the establishment of a new and robust stratigraphic framework for this well-known formation. For the first time the characterization of the Mellegueiceras c...

ABSTRACT Aptian to early Albian times were marked by various geodynamic and paleoenvironmental events such as large igneous province volcanism , perturbations of climate and the carbon cycle, and sea-level changes. The Essaouira-Agadir basin (EAB), located on the Atlantic passive margin of Morocco, offers good and fossiliferous exposures of the Apt...

Abstract The Essaouira-Agadir Basin (EAB, Morocco) which presents numerous and well-exposed outcrops of the Lower Cretaceous series, was chosen to establish an integrated stratigraphic framework for the latest Barremian–early Albian, based on i) identification of sedimentary discontinuities, ii) high-resolution ammonites and calcareous nannofossil...

Difficulties of establishing a standard Mediterranean ammonite zonation of Aptian and Albian stages is a long-standing issue, which origination lies in paleobiogeographic reasons, debates on taxonomic problems and widespread presence of hiati, condensation and reworked levels, while poor record of ammonites is also connected to several biotic crise...

The Subalpine Urgonian platform provides seismic-scale outcrops of interest to constrain the depositional organisation of Lower Cretaceous carbonate systems. Revising the biostratigraphy using ammonites, rudists, calcareous algae and orbitolinids and establishing regional stratigraphic correlations between the Gresse-en-Vercors cliff and the Platea...

Abstract The Essaouira-Agadir Basin (EAB, Morocco) which presents numerous and well-exposed outcrops of the Lower Cretaceous series, was chosen to establish an integrated stratigraphic framework for the latest Barremian–early Albian, based on i) identification of sedimentary discontinuities, ii) high-resolution ammonites and calcareous nannofossils...

The Cretaceous marine transgression proceeded through successive steps from the Albian to the Turonian (dated with ammonites). The onlapping wedge begins with coastal transgressive-regressive short-term sequences on massive, probably fluvial sandstones to be correlated with the very thick continental Lower Cretaceous succession found in the Puerto...

The Late Palaeozoic temnospondyl Sclerocephalus haeuseri is known from numerous specimens and formations in the Lower Rotliegend sequence of the Saar-Nahe Basin, SW Germany. The type specimen was long believed to be lost, and therefore a neotype was determined. A diagnostic partial skull, curated in the paleontological collection of the University...

In this paper we study the ammonoid taxonomy and biostratigraphy from the upper Aptian to the lower Albian of the Cerro Chino area, with an emphasis on an accurate taxonomic characterization of the American endemic forms Kazanskyella, Quitmanites, Immunitoceras and Huastecoceras. These genera are important because they are characteristic of the uni...

The aim of this study was to reconstruct the paleoenvironmental evolution of the Essaouira-Agadir Basin (EAB) during the Aptian-Albian and propose a functioning model for sedimentation in its mixed carbonate/clastic ramp. Nine sections were studied to define the sedimentary facies, and 189 samples were collected and analyzed for calcareous nannofos...

The latest Barremian-lower Albian interval of the southern Tethyan margin is poorly understood because sedimentary successions are frequently incomplete, and dating is difficult. The Essaouira-Agadir Basin (EAB) contains numerous, fossiliferous, and accessible outcrops of the Lower Cretaceous series. The aim of this work was to establish an integra...

In this work, we review the ammonites of the Montmell Formation in the Marmellar area housed in the collections of the Museo Geológico 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 tardefu...

La coquille figurée sous le nom de Cypraea (Eocypraea) levesquei par Cossmann & Pissarro (1911) dans l’“Iconographie” et provenant du Cuisien (Yprésien, Eocène Inférieur) de Cuise-la-Motte (Oise), n’est pas du tout la coquille pour laquelle Deshayes (1835) a attribué ce nom. Nous en donnons la description et proposons de désigner cette espèce nouve...

Informatic inventory of the localities with Rhinocerotidae of the European Neogene and Quaternary. The file of Tertiary and Quaternary age fields with mammals was created within our lab, by a researcher at the beginning of the 1960s. This file contained a series of geographic descriptors (site, locality, department, region, country, location) and g...

Digitisation and computerizing of the palaeontological sites file of the Geological collections at Université C. Bernard Lyon 1. In 1965 the French and foreign paleontological sites file was created at the Université C. Bernard Lyon 1. Data fields comprised in each file were: country, department, town, site, topographical and geological maps, preci...

The Lower Fezouata Formation (Lower Ordovician, Morocco) has yielded a remarkably diverse exceptionally-preserved biota, which provides unique insights into the transition between the Cambrian and Palaeozoic Evolutionary Faunas. Until recently, fossils from these deposits were collected from small isolated excavations, the stratigraphic positions o...

On the southern Tethyan margin, the Late Aptian-Early Albian interval is poorly understood since sedimentary successions are frequently incomplete and dating is difficult. The Essaouira-Agadir Basin (EAB, Morocco) presents numerous, very good and accessible outcrops of the Cretaceous successions. The aim of this work is to reconstruct the paleoenvi...

L'Ordovicien inférieur de la région de Zagora est renommé internationalement pour ses faunes à préservation exceptionnelle (Fezouata Biota) qui documentent la transition jusqu'alors peu connue entre "l'explosion cambrienne" et "la grande biodiversification ordovicienne". Depuis la découverte des premiers gisements au début des années 2000, leur exp...

Au cours des années 2000, la découverte de nombreux gisements à préservation exceptionnelle dans la Formation des Fezouata (Ordovicien inférieur), dans la région de Zagora (Anti-Atlas central, Maroc), a permisde documenter, pour la première fois, des assemblages marins particulièrement riches et diversifiés, dont la préservation est comparable à ce...

We describe a new chimaeriform fish, Callorhinchus torresi sp. nov., from the uppermost Cretaceous (late Maastrichtian) of the López de Bertodano Formation, Isla Marambio (Seymour Island), Antarctica. The material shows it is distinct from currently known fossil and extant species of the genus, whereas the outline of the tritors (abrasive surfaces...

Acanthoceras gevreyi Jacob, 1907 originates from a condensed Albian horizon at La Perte du Rhône, Bellegarde (Ain, France). This species is still very poorly known and its taxonomic interpretation in the literature is most often erroneous. New and abundant material from SE France, North Africa and South America allows the revision of this taxon and...

The genus Tegoceras Hyatt, 1903, is crucial for the understanding of the Upper Lower Albian of the Andean Basins. In South America, the genus was only described in Colombia (Etayo Serna, 1979) and Venezuela (Renz, 1982). New analysis of Colombian material of the Breistroffer’s collection allow us to first mention Tegoceras camatteanum (d’Orbigny, 1...

The Ayabacas Formation of southern Peru is an impressive unit formed by the giant submarine collapse of the mid-Cretaceous carbonate platform of the western Peru back-arc basin (WPBAB), near the Turonian–Coniacian transition (∼90–89 Ma). It extends along the southwestern edge of the Cordillera Oriental and throughout the Altiplano and Cordillera Oc...

The Upper Aptian-Lower Albian Mural Formation of the Bisbee Group in northern Sonora consists of eight members, in ascending order the Fronteras, Rancho Bufalo, Cerro La Ceja, Tuape Shale, Los Coyotes, Cerro La Puerta Shale, Cerro La Espina and Mesa Quemada. These members represent shallow marine facies of a major marine transgressive-regressive ev...

Trabajos relacionados con la ampliación de la vía de acceso a la ciudad de Yantzaza, ubicada al noroeste de la Provincia de Zamora Chinchipe, permitieron localizar un afloramiento con una fauna abundante y variada de moluscos del Cretácico. Litológicamente, este afloramiento está constituido de lutitas grises calcáreas, depositadas en ambiente mari...

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 Dipolocer...

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 Dipolocer...

Our understanding of the Cretaceous ammonite succession of Peru is mainly based on the reference work of Benavides Ca ́ceres (1956) that updates the descriptive paleontological papers by Gabb (1877), Sommermeier (1910), and Knechtel et al. (1947), among others. New fossil collections made in the course 1995 and 1999 in northern and central Peru pro...

Recent study of the Albian ammonite fauna from Peru provides a major revision of the systematic position and taxonomy of the family Engonoceratidae, which we place in the superfamily Pulchelliaceae. We consider the oldest south Tethyan representatives, specifically the mahmoudii species described in Algeria, ancestors of the Andean taxa. Peruvian s...

The study of the ammonite fauna of the Lower to Early Upper Albian formations allow a major revision of the biostratigraphic frame of Northern and Central Peru. A new subdivision in ammonites zones, subzones and bio-horizons terms is proposed. The Lower Albian is represented by the Nicholsoni Biozone (subdivided into the umbilicostatus and nicholso...

The study of the ammonite fauna of the Albian formations allows a major revision of its biostratigraphic frame in northern and central Peru. A carving in ammonite biozones is proposed for the Inca, Chulec and Pariatambo Formations and the Pulluicana group. The Lower Albian is represented by the Nicholsoni Biozone (subdivided into the umbilicostatus...

Thesis (doctorate)--Université Paul Sabatier, Toulouse, France, 2001. Includes bibliographical references.

Revision of the stratigraphy of the ‘Marnes noires à Hypacanthoplites’ Fm. of the eastern South-Pyrenean Zone provides evidence for the recognition of a supplementary third-order depositional sequence, inserted between the Ap5 and Ap6 sequences of the litterature. Its lower boundary falls within the Jacobi subzone (Upper Aptian, Clansaysesian auct....

Revision of the stratigraphy of the 'Marnes noires à Hypacanthoplites' Fm. of the eastern South-Pyrenean Zone provides evidence for the recognition of a supplementary third-order depositional sequence, inserted between the Ap5 and Ap6 sequences of the litterature. Its lower boundary falls within the Jacobi subzone (Upper Aptian, Clansaysesian auct....

The stratigraphic revision of the Cretaceous series of Northwestern Peru and Southwestern Ecuador shows that, subsequently to the Albian transgression, three distinct forearc sedimentary basins were formed. These are the turbidity-filled Lancones-Celica Basin (Late Albian to Coniacian or Santonian), the Paita-Yunguilla Basin mainly filled by shales...

During the Early Cretaceous, the active margin of Peru and Ecuador presented four paleogeographic longitudinal (E-W) zones : a coastal zone, a western basin, the Maranon threshold (Geanticline), and an eastern basin. Three groups of transgressive sediments were deposited in these zones : fluvio-marine sandstones, directly overlying the basement ; t...

D'après de nouvelles données stratigraphiques, le "bassin de Celica" s'est formé vers la limite Albien moyen-supérieur, s'est rempli de turbidites jusqu'au Coniacien (?), puis a été déformé et a émergé au cours du Sénonien. Un nouveau bassin d'avant-arc, oblique et discordant sur le "bassin de Celica" s'est ensuite formé au Campanien (moyen ?) et a...