Search results for "Earth"

Middle Triassic sharks from the Catalan Coastal ranges (NE Spain) and faunal colonization patterns during the westward transgression of Tethys

2020

Abstract Palaeogeographic changes that occurred during the Middle Triassic in the westernmost Tethyan domain were governed by a westward marine transgression of the Tethys Ocean. The transgression flooded wide areas of the eastern part of Iberia, forming new epicontinental shallow-marine environments, which were subsequently colonized by diverse faunas, including chondrichthyans. The transgression is recorded by two successive transgressive–regressive cycles: (1) middle–late Anisian and (2) late Anisian–early Carnian. Here, we describe the chondrichthyan fauna recovered from several Middle Triassic stratigraphic sections (Pelsonian-Longobardian) located at the Catalan Coastal Basin (western…

Palynofacies and calcareous nannofossils in the Upper Kimmeridgian, southeastern Paris basin (France)

2005

AbstractThe Upper Kimmeridgian Members “Calcaires blancs supérieurs” and the “Marnes à exogyres supérieures” of the southeastern Paris basin were investigated for their palynofacies and calcareous nannofossils. These members display alternating limestone-marl lithotypes and represent shallow marine palaeoenvironments. The lower carbonate member is interpreted as a proximal palaeoenvironment (palaeobathymetry = 5 to 10 m), where storm and swell deposits were prevalent and the salinity was occasionally weak. The relative richness of brown phytoclasts in this part is favoured by good preservation related to restricted conditions. These conditions would explain the dominance of the nannofoss…

Les pistes d’archosauriens : Kayentapus ubacensis nov. isp. (théropodes) et crocodylomorphes du Bathonien des Grands-Causses (France). Conséquences p…

2018

Resume Deux sites a traces de pas tridactyles II–IV de theropodes et de « probables » sauropodes des Grands Causses, sommairement decrits en 2006, sont ici reetudies. Il s’agit des sites du Capelan (commune de Meyrueis, Lozere) et de la Garene (commune de La Roque-Sainte-Marguerite, Aveyron), tous deux d’âge Bathonien. En 2012, l’un d’entre eux (Le Capelan) a fait l’objet d’une fouille et d’un agrandissement, permettant la decouverte de nombreuses traces. Dans le site du Capelan, 102 epireliefs concaves, compris entre 11 et 36 cm de longueur, appartiennent a, au moins, 21 pistes; la plus longue etant visible sur 37 metres. Dans l’ensemble, ces empreintes sont presque aussi longues que large…

Ichnological evidence of semi-aquatic locomotion in early turtles from eastern Iberia during the Carnian Humid Episode (Late Triassic)

2018

Abstract Some of the earliest European records of fossil turtle footprints (Late Triassic, Middle Carnian, ~ 227–237 Ma) are interpreted from 46 footprints from three outcrops, Domeno, Quesa and Cortes de Pallas, located in the Iberian Range (eastern Spain). The samples were obtained from Upper Triassic rocks in Keuper Facies. They are characterized in the studied area by two well-defined evaporitic sequences, separated by a detrital stratigraphic interval, constituting the Manuel Sandstones Formation in which the studied fossil footprints were recorded. These fluvial deposits are correlatable with the Carnian Humid Episode. The footprints are tridactyl and tetradactyl, mainly digitigrade, …

Les forages de Juzanvigny (Aube, France): lithobiostratigraphie des formations du Barrémien à l'Albien moyen dans l'est du bassin de Paris et datatio…

2017

RESUME Dans le departement de l'Aube, region stratotypique de l'etage Albien, plusieurs forages realises en 2013 ont traverse la plus grande partie des Argiles tegulines de Courcelles ou « Gault » auct. (Albien inferieur et moyen), les Sables verts de l'Aube (Aptien superieur), les Argiles a Plicatules (Aptien inferieur), les Sables et argiles bariolees (Barremien superieur) et la partie superieure des Argiles ostreennes (Barremien inferieur). Une description lithologique detaillee de la succession est realisee dans le but d'ameliorer la connaissance du Cretace inferieur de la bordure orientale du bassin de Paris dont les affleurements sont peu nombreux et discontinus. En ce qui concerne l'…

Les ammonites du Pliensbachien du jebel Bou Rharraf (Haut Atlas oriental, Maroc).

2011

60 pages; International audience; L'originalité des dépôts sédimentaires et des faunes d'ammonites du jebel Bou Rharraf repose sur la présence de faciès « Ammonitico Rosso », les plus occidentaux connus pour le Pliensbachien, une forte diversité des Phylloceratida (Phylloceras, Calaiceras, Zetoceras, Partschiceras et Juraphyllites) et une disparité morphologique importante chez les Galaticeras, Miltoceras et les Tauromeniceras. Si quelques formes, telles que Miltoceras taguendoufi et Mauretaniaceras elmii nov. gen., nov. sp. ont un cachet endémique très affirmé, les faunes du Pliensbachien du Haut Atlas oriental sont classiques pour la marge sud de la Téthys occidentale. Trois genres (Callo…

Advances in Cretaceous palaeontology and stratigraphy – Christopher John Wood Memorial Volume; editors' preface

2018

Abstract In the last week of January 2016, the ‘Cretaceous community’ lost another of their prominent members, Chris Wood. During recent decades, Chris had been active in the United Kingdom as well as in mainland Europe, particularly in Germany and Poland. Several years ago he had been forced to leave the ranks of Associate Editors with Cretaceous Research , due to a severe illness that he was adamant to overcome. Later in 2016, two of us, fellow editors with that journal for a number of years, with the help of Rory Mortimore, approached former colleagues and friends of Chris's to contribute to a special issue. From the start, the idea has been to cover all aspects of Cretaceous stratigraph…

Bats from the classical site of Venta del Moro (Late Miocene, Eastern Spain)

2017

The presence of bat fossils in localities of fluvio-lacustrine origin is quite uncommon, and usually these remains are poorly preserved or not studied in detail. In the present work we study the ba...

2017

This paper focuses on the technological characteristics of Keilmesser with a lateral tranchet blow modification on the cutting edge. It examines the underlying technological production of these bifacial objects: this implies the evaluation of their working stage succession, as well as produced forms necessary for the execution of tranchet blow performance. Furthermore, it offers a techno-morphological description of these enigmatic tools. The Keilmesser with tranchet blow and corresponding blanks of tranchet blows from Grotte de la Verpilliere I in Germolles (Saone-et-Loire, France) are used as case study. The collection of Keilmesser with tranchet blow and corresponding blanks of tranchet …

TRACKING DINOSAURS IN COARSE-GRAINED SEDIMENTS FROM THE UPPER TRIASSIC OF ARDÈCHE (SOUTHEASTERN FRANCE)

2020

ABSTRACT Coarse-grained sediments deposited in high-energy environments are usually considered unfavorable to the preservation of fossil tracks. Here we report dinosaur footprints showing good physical preservation, despite being found in coarse-grained sandstones of alluvial origin from the Upper Triassic of Ardèche, southeastern France. The ichnoassemblage, dominated by Grallator isp., raises questions about the processes leading to the formation and preservation of tracks in coarse-grained sediments. The track-bearing surface is a medium- to coarse-grained quartz arenite that is microconglomeratic locally. The tracking surface grain size ranges from 0.2 to 2 mm and numerous pebbles are p…