Abstract
Palaeoclimatic signifiance of the Redonian echinoids from the Late Atlantic Neogene. The Redonian “faluns” outcropping in numerous localities of the North-Western France provides special echinoid faunas containing marsupiate echinoids. The Redonian notion is redefined according to unpublished observations realized on the stratotype outcropping in the Rennes area. Lithological descriptions of the stratotypical facies are given. New datations realized on the Rennes area and on different Redonian localities of Western France show that several Redonian outcrops, and so the marsupiate echinoids that they contain, are Messinian in Brittany, and Pliocene in Vendée, in Loire-Atlantique and in Manche. The presence of such marsupiate species in North-Western France at the end of the Neogene is interpreted as a phenomenon induced by temperature and stream perturbations of the water with input of cold water via the East Armorican strait at the Middle-Late Miocene and during the Pliocene, and by a more general cooling during the Messinian.
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