Les faunes d’ammonites du Pliensbachien inférieur des séries dauphinoises de la Durance (Jurassique inférieur, Barrage de Serre-Ponçon, Hautes-Alpes, France) |
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Authors: | Jean-Louis Dommergues Christian Meister |
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Affiliation: | a Centre des sciences de la Terre de l’université de Bourgogne, UMR CNRS 5561, biogéosciences Dijon, 6, boulevard Gabriel, 21000 Dijon, France b Département de géologie et paléontologie, Muséum d’histoire naturelle, 1, route de Malagnou, case postale 6434, 1211 Genève, Suisse |
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Abstract: | The Liassic ammonite faunas and especially those of the Early Pliensbachian are of major importance for the understanding of the stratigraphic framework of the “Dauphiné” zone of the southern subalpine ranges (“dôme de Remollon”). Until now, only listed by the authors, these faunas are, for the first time, described and illustrated in the present paper. With about twenty species, these faunas cover the whole of the Early Pliensbachian. There are poorly diversified and of clearly Euroboreal affinities. Nearly all of the species are abundant and common in most of the NW European fossiliferous localities. Despite of a paleogeographical location fairly close to the Alpine zones (Southern Alps and Austroalpine units) with rather diversified faunas of mainly Mediterranean affinities, none Mediterranean taxa are present in the studied area. Unfortunately, the current stratigraphic and paleogeographic knowledge do not allow to ascertain if this reflects a separation due to paleoenvironmental or true paleogeographic barriers. In this latter case, the general geologic implications would be remarkable. |
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Keywords: | Ammonites Pliensbachien infé rieur Alpes externes Biostratigraphie Palé obiogé ographie Palé obiodiversité |
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