الفهرس 
Introduction
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Abstract
The present work deals with the Biostratigraphy of the Upper Cretaceous-Lower Paleogene successions in western Sinai, Egypt. Three sections named Gabal Nazzazat, Gabal Nulhul and Wadi Gharandal have been collected, sampled and studied based on planktonic foraminiferal and calcareous nannofossil contents. Lithostrigraphically, the studied intervals have been distinguished into three rock units arranged from base to top as follows: Sudr Chalk, Esna Shale and Thebes Formation. One hundred seventy three planktonic foraminiferal species and One hundred seventy one calcareous nannofossil species are identified which led to the reorganization of 26 planktonic foraminiferal and 19 calcareous nannofossil zones and subzones. Stage boundaries within this time have been retraced and discussed, specially K/P and P/E boundaries. The K/P boundary is placed at the extinction level of tropical-subtropical planktonic foraminiferal species and just before the acam occurrence of Thoracosphaera operculata (calcareous nannofossil). Continuous sedmentation around this boundary is recorded in all studied sections. The B/E transition is located within the upper part of Esna Formation and can be delineated as the first appearance datum of Acarinina sibaiyaensis , Acarinina africana and Morozovella allinsoensis by the means of planktonic foraminifera and at the base of NP9b calcareous nannofossil Subzone. The other stage boundaries through this interval are also discussed. The P/E boundary is placed at the base of planktonic foraminifera E1 Zone and calcareous nannoplankton NP9b Subzone within the upper part of Esna Shale. The paleoenvironmental conditions and plaeobathymetry prevailed during the deposition of this interval is reconstructed based on the analysis of the studied microfossil groups. Ten ecological zones have been deduced through the studied interval.