Les paléoenvironnements éocènes à crinoïdes pédonculés des marnes de Miretrain (Angoumé, SW France) : interprétations paléobathymétriques |
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Authors: | Michel Roux Bruno Cahuzac Károly Sztrákos |
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Institution: | 1. Laboratoire des sciences de la Terre, université de Reims, UMR CNRS Biogéosciences, CREA, 2, esplanade Roland-Garros, 51100 Reims, France;2. Laboratoire de recherches et applications géologiques, université Bordeaux-1, 351 cours de la Libération, 33405 Talence cedex, France;3. 35, rue Savier, 92240 Malakoff, France |
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Abstract: | A well-diversified fauna of stalked crinoids was found in the Eocene series exposed in the quarry of Miretrain at Angoumé (Landes, southwestern Aquitaine, northern edge of the Tercis diapir structure). The most frequent taxa belong to the genera Isselicrinus and Conocrinus. Adaptive stalk characters related to depth in the pentacrinid genus Isselicrinus allow us to document the bathymetric zonation of stalked crinoids during the Eocene. Both stalked crinoids, benthic foraminifera and additional organisms give convergent information on palaeodepths throughout the progradation of sedimentary bathyal slope between the two major tectonic events providing Pyrenean foreland shortening. The depth changes from more than 700 m (maybe about 1000 m) at the base of the series (Middle Lutetian) to about 50 m at the top (Late Bartonian). To cite this article: M. Roux et al., C. R. Geoscience 338 (2006). |
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Keywords: | Crinoïdes pédonculés Environnement bathyal Paléobathymétrie Éocène Aquitaine Pyrénées France Stalked Crinoidea Bathyal environment Palaeodepth Eocene Aquitaine Pyrenees France |
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