Abstract
Abstract Paleogeography of the southeastern part of the Paris basin during the lower and middle Eocene (Sparnacian-Ypresian-Lutetian) is revealed by X-ray sedimentologic study of sedimentary formations in the Chatillon-sur-Morin quarry near Esternay. Kaolinitic clays with small amounts of Sparnacian detrital materials represent deposition in lakes or lagoons. Attapulgite, indicating a regressive episode, occurs in the upper Sparnacian at Sezanne. The Cuisian (Ypresian) is made up of sandstones and kaolinitic clays overlain by marl becoming progressively more limy, and ending with siliceous limestone of the Sahara hamada type. The surface of the siliceous limestone is covered by attapulgite indicating a final regressive episode following progressive drying of the climate as revealed by increase in the amount of attapulgite upward in the Cuisian. The Lutetian (middle Eocene) is transgressive, with kaolinitic marl grading upward into freshwater limestone.
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