The Neogene and Lower Pleistocene crags of Upper Normandy: Biostratigraphic revision and paleogeographic implications |
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Authors: | Olivier Dugué Chantal Bourdillon Florence Quesnel Jean-Pierre Lautridou |
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Institution: | 1. Université de Caen, département des sciences de la terre, esplanade de la Paix, 14032 Caen cedex, France;2. UMR 6143 CNRS, laboratoire de morphodynamique continentale et côtière (M2 C), 24, rue des Tilleuls, 14032 Caen cedex, France;3. ERADATA, 170, avenue Félix-Geneslay, 72100 Le Mans, France;4. BRGM, GEO/G2R, BP 36009, 45060 Orléans cedex 2, France |
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Abstract: | The biostratigraphic revision of the benthic foraminifera present in the coastal Cenozoic quartzose and shelly sands (crags) at Fécamp and Valmont (Seine-Maritime) reveals Early Pliocene (Fécamp) and Early Pleistocene (Valmont) ages. The Tortonian-Messinian thanatocœnosis contained in the Fécamp Crag shows the presence of a former bryozoan-rich platform on the floor of the Channel that was reworked during the Lower Pliocene transgression. Tortonian-Messinian and Lower Pliocene deposits have been found in Belgium, England, Brittany, and at Fécamp, but are absent in Cotentin (North-West Normandy), which was uplifted at this period. The Lower Pleistocene tidal sands and crags described in Cotentin, Upper Normandy and the southern North Sea Basin indicate a marine passage between the Channel and the North Sea. |
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Keywords: | Normandy Armorican Massif Neogene Early Pleistocene Foraminifera Crags France |
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