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Les mollusques des sables éocènes de Bois-Gouët (Loire-Atlantique)

Abstract : n the South of Armorican Massif (Northwest of France), the Eocene is known by small outcrops of sands and marine limestone and/or sandstone rarely fossiliferous. One of the most famous are the shelly sands of Bois-Gouët, near Saffré (Loire-Atlantique department), with is more than 1,000 species belonging mostly to gastropods and bivalves. This locality was discovered in 1877 by a young palaeontologist of the Paris university, Gaston Vasseur, and the fauna was originally described by Maurice Cossmann after a new excavation carried out in 1895 and directed by Auguste Dumas, of the Museum of Natural History of Nantes. Since its discovery, the shelly sands of Bois-Gouët were nearly always considered as the equivalent of the base of the ‘Calcaire Grossier supérieur de Paris’ and attributed to the Upper Lutetian (Middle Eocene) but, after the recommandations of Mathelin & Bignot (1989) these deposits are now considered rather as Barthonian. The Bois-Gouët fauna is mostly dominated by gastropods (numerous terrestrial, freshwater, brackish and marine species, with a few endemic genera as Otomphalus, Casimiria, Velainella, and Gouetina) and bivalves associated to rarer cephalopods (mostly cuttlefishes lato sensu), scaphopods, brachiopods (Terebratula, Crania…), corals, sea-urchins (mainly Praescutella cailliaudi (COTTEAU 1861)), bryozoans, and crustaceans. The subspecies Velates perversus vasseuri nov. subsp. is described. Some remains of vertebrates were also gathered as isolated tooth of sharks and otolithes of teleostean fishes, costal scutes of turtles and tooth of the Lophiodon parisiense GERVAIS 1850 [an extinct species of mammal related to tapirs].
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Submitted on : Tuesday, February 24, 2015 - 10:58:01 AM
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  • HAL Id : insu-01119850, version 1


Patrice Lebrun, Philippe Courville, Jean-Michel Pacaud. Les mollusques des sables éocènes de Bois-Gouët (Loire-Atlantique). Revue Française de Paléontologie, 2012, Les coquillages de l'Éocène du Bassin parisien, un trésor inestimable vieux de plusieurs dizaines de millions d’années, pp.92-97. ⟨insu-01119850⟩



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