CONTRIBUTION TO SEDIMENTARY NATURE OF EOCENE SEQUENCE, FAIYUM. EGYPT. SAYED M. AHMED Geology Dept., Fac. Sciences, Banha Branch, Zagazig Univ., Banha, Egypt. The Eocene rocks in Faiyum area are subdivided into six formations, from base to top: Samalut, Rayan, Gebel Hof, Ravine, Birket Qarun and Qasr EI-Sagha. The Qasr EI-Sagha Formation was subdivided into, lower, middle and upper members. Pertographically, 27 microfacies are identified. The Samalut Formation (Early to Middle Lutetian) has its lower part as a mound reefs, while open marine platform environment dominated during the depoaition of its upper part. The Rayan rocks (Late Lutetian) indicate deposition in an oscillating shelf that received siliciclastic and carbonate sediments. The Gebel Hof Formation (Late Lutetian) was probably deposited in a shallow subtidal environment. By the beginning of the Bartonian, the Ravine rocks have been deposited in a relatively deep subtidal environment. During the Bartonian the clastics and limestone interbeds of Birket Qarun Formation were formed in a shallow subtidal shelf. Finally in the Priabonian, the Qasr EI-Sagha sediments were formed in shallow inner shelf and fluvial environments.