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Dans ce travail, la méthode de la raréfaction est utilisée pour faire une estimation de la perte d'information due à des processus taphonomiques dans une association de foraminifères benthiques. Les résultats préliminaires obtenus semblent indiquer que cette perte d'information est liée à des différences dans la taille des individus ainsi qu'à la composition et aux caractéristiques du test. Ainsi,...
The holotype of Atacisaurus crassiproratus Astre, 1931 (Middle Eocene; Issel, France) is herein reinterpreted and attributed to cf. Iberosuchus. The holotype of A. crassiproratus consists of a fragment of a mandible that Astre (1931) assigned to an eusuchian crocodile. However, the combination of characters that we have recognized in this mandible allows to consider it as a member of the Metasuchia...
Les associations d'ostracodes du Paléocène supérieur et de l'Eocène de Caravaca (Sud de l'Espagne) sont,au moins en partie, constituées d'espèces nouvelles dont Trachyleberidea marginata nov. sp., à la fois abondante et caractéristique. De même que Cytherella sp. 1 aff.navetensis, Bairdia cf. cymbula, Krithe sp. 1 et Oertliella ? sp. 1 aff. aculeata, T. marginata est présente sur toute la hauteur...
Estrellichnus jacaensis igen nov., isp. nov. is a large radial trace fossil preserved as hypichnial semireliefs. It occurs in Eocene flysch deposits (depositional lobe facies) of the Hecho Group, north of Jaca in northern Spain. It is interpreted as a subsurface burrow composed of a central shaft and radiating tubular tunnels, produced by an unknown tracemaker. Estrellichnus jacaensis is similar to...
The Eocene (Bartonian) marls of the La Guixa Member and Gurb Member, Vic Marls Formation (Ebro Basin, Catalonia, Spain), contain a very rich and diversified siliceous sponge fauna. The fauna is dominated by hexactinellids; lithistids and other demosponges are rare. It consists of 16 species representing 16 genera. Eleven new species and two new genera are proposed for these sponges: Reguantella cavernosa...
Osonachelus decorata nov. gen., nov. sp., is the first named chelonioid turtle from the Iberian Peninsula. This Eocene turtle was found in the marine sediments of the Vespella Marls Member (Vic-Manlleu Marls Formation, upper Bartonian) that occur in the Osona county (eastern Ebro Basin, Province of Barcelona, Catalonia, Spain). The area is rich in invertebrate, fish, and plant fossils but various...
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