الفهرس 
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Abstract
The Eocene successions exposed at Wadi Degla, Gebel Abu-Shama and Gebel Qattamia, North Eastern Desert, Egypt were subjected to detailed lithostratigraphic and micropaleontological investigations. The Middle and Upper Eocene successions in the studied areas are subdivided into three rock units that arranged from base to top; Observatory, Qurn and Maadi formations.
Microlithofacies examination of the studied Eocene sedimentary rocks has led to the identification of limestone microfacies (mudstone, wackestone, packstone and grainstone) and terrigenous microfacies. This analysis was used to determine the depositional environments and paleobathymetry. Detailed systematic studies of foraminifera as well as ostracods has led to the identification of 56 species of benthic forams, 15 species of planktonic forams and 20 species of ostracods.
Based on Benthic foraminifera, Gebel Qattamia yielded 1 benthic foraminiferal Zone; Quinqueloculina seminulum Zone. Wadi Degla and Gebel Abu-Shama yielded 3 subzones arranged from oldest to youngest; Quinqueloculina carinata, Uvigerina rippensis and Textularia adalta subzones. Based on Ostracods, the three studied sections yielded 3 Zones arranged from oldest to youngest; Cytherella tarabulusensis - Ruggieria (Keijella) glabella Zone, Xestoleberis subglobosa Zone and Uromuellerina saidi Zone. Biostratigraphic evaluation of the recorded faunas revealed that the recorded assemblage is typically of a Middle and Upper Eocene assemblage.
The recorded benthic foraminifera in Gebel Qattamia suggested the deposition in brackish/lagoonal environment (restricted Zone) with abnormal saline marine water. While, in Wadi Degla and Gebel Abu-Shama suggested the same paleoenvironmental conditions with short episodes of relative deep sea level and normal saline marine water. The recorded ostracod fauna indicates deposition in marine environment, under inner to middle neritic environmental settings with short transient intervals reflecting a deeper outer neritic setting.