Flore du Jurassique basal de la ville de Mende (Lozère) : synthèse des gisements historiques, nouvelles données sédimentologiques, paléontologiques et paléoenvironnementales

Abstract : During the 20th century, because of urbanization, most palaeontological sites yielding plants (Hettangian–Sinemurian in age) from the city of Mende have disappeared, or they have been forgotten. This article presents a synthesis of sites yielding plants, from their discoveries in the 19th century to recent prospecting. New lithostratigra- phic and palaeobotanical data are brought for two historic sites (Ravin del Pouset and Petit Séminaire), as well as two new localities (Causse d’Auge road and Gardès road). This study reveals the diversity of plant-containing lithofacies (dolomudstone, marl, limestone/calcarenite and oo-bioclastic limestone) and the diversity of plant preser- vations (charcoalified compressions with or without cuticle, isolated cuticle, external casts/impressions). Microfaciological study of plant beds demonstrates the diversity of depositional environments. Protected, restricted and shallow environments with low wave exposure and probable euryhaline conditions are clearly the most favourable to the accu- mulation and the preservation of fossil plants. These early Liassic palaeofloras, among the southernmost yet reported for Laurasia, are of significance for the plant geography and global paleoecology at that time.
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Jean-David Moreau, Marc Philippe, Frédéric Thévenard. Flore du Jurassique basal de la ville de Mende (Lozère) : synthèse des gisements historiques, nouvelles données sédimentologiques, paléontologiques et paléoenvironnementales. Comptes Rendus Palevol, Elsevier Masson, 2019, 18 (2), pp.159-177. ⟨10.1016/j.crpv.2018.07.002⟩. ⟨hal-02092413⟩

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