At a new road cut near Chapelle-en-Serval (France) a sedimentary sequence is exposed in which Beauchamp facies continental sands and sandstones are overlain by coarse lagoonal sandstones of the Ducy formation, in turn overlain by calcareous sandstones of the Mortefontaine formation, and capped by silty limestone of the St. Ouen formation. The Beauchamp-Ducy contact marks the boundary between Auversian and Marinesian time and indicates a post-Auversian emergence. The rapid increase of Discorbis bractifera in the Ducy beds indicates a lagoonal environment associated with the lacustrine deposition. The Marinesian transgression is indicated by increasing salinity observed in the succession of faunal assemblages.

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