Recent detailed paleontologic and sedimentologic studies of the type locality of the Auversian at Guepelle, France, showed a complete succession of beds from the upper Lutetian to the Marinesian, characterized by Avicula defrancei in sandstone blocks ascribed to the Mortefontaine formation. A sequence of five facies is recognized which is mainly composed of sandstones with a rich and well-preserved fauna, including 200 molluscan species and some ten mammalian species. A detailed list of the fauna collected is given together with a lithologic description of the Guepelle locality.

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