Les Ostracodes de la falunière de Grignon (Lutétien du Bassin de Paris): implications stratigraphiques

• DOI: 10.5252/g2012n4a12
• Publication Date: 2012-12-31T11:05:19Z
• Authors: Claude Guernet; Damien Huyghe; Franck Lartaud; Didier Merle; Laurent Emmanuel; Jean-Pierre Gély; Florent Michel; Ophélie Pilet
• Keywords: Marl; Paleoecology

The ostracod fauna from the outcroup "la falunière" of Grignon (Lutetian, Paris Basin): stratigraphical implications.The rehabilitation (shell marl pit) allowed for first time to take an almost complete section Basin Middle Lutetian under its uncimented facies. It was opportunity undertake sedimentological and paleontological studies. This publication presents results ostracode study. More than 6000 valves or carapaces were collected 87 species distinguished. Three new are described : Paracypris keiji n. sp., Neocytherideis labyrinthoidea sp. Grinioneis pachycosta ostracodes vertical distribution in faluns is probably without signification. On contrary, associations characteristic, as well comparison with those Ypresian that Auversian Barton beds. Specific diversification reflects environmental niches wealth individuals testify abundance food. Ostracodes indicate sea shallow, some decimetres metres, probably, waters limpid, not much agitated. summer temperature water equal at least present Mediterranean Sea. From a paleogeographic point view, similarity between gallic seems more narrow whatever this Aquitanian basin; so, majority English known while proportion common North Aquitain basin weak.