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The Middle-Upper Eocene sediments of the Fayum District are represented by Gehannam, Birket Qarun and Qasr El-Sagha formations. Both field studies and laboratory analyses on the concerned sediments have enabled to distinguish six lithofacies. These lithofacies proved that the present sediments were deposited in transitional paralic environment of active northward - prograding deltaic subenvironments contemporaneous with rabid but gradual sea level drop. It is started with the delta front silt-shale (Gehannam Formation) of 20 m thick, followed by distributary mouth bars of cross-bedded...