الفهرس 
Grain size analysisOnly 14 pages are availabe for public view
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Abstract
The present thesis concerns with the study of the exposed Cretaceous1 Tertiary successions in thee different localities in central Egypt: Quseir area, Central Nile Valley and the Kl~argaO asis. The study was carried out in order to shed some light on the nature of the WT contact and to locate the major variations in mineralogy and chemistry, as well as, to document the nannoplankton changes across that boundary. A total of 259 samples were collected from the Dakhla (Shale) Formation in four stratigraphc sections. One section was sampled from Gebel Atshan in the Quseir district and two sections were measured fiom the central Nile Valley at Gebel Abu Had and Gebel El Gir (Taramsa section) near Qena whle the fourth section was sampled fiom Gebel El TeirITarawan in the Kharga Oasis. The Upper Cretaceous-Lower Tertiary succession of the Nile Valley facies comprises a number of stratigraphic rock units. They are from base to top; the Nubia Sandstone, Quseir Shale, Duwi Formation, Dakhla Shale, Tarawan Chalk, Esna Shale and Thebes Formation. In the studied sections, the WT boundary lies within the Dakhla (Shale) Formation. The lithology of the Dakhla Shale varies from calcareous shale to argillaceous limestone to limestone and marl. The Cretaceous1 Tertiary boundary interval in G. Atshan section is represented by ferruginous, reddish brown shale whereas no lithologc change is observed across the WT boundary in the Taramsa sections. In G. Abu Had section, the KIT boundary layer is represented by a highly fissile clayey shales while in G. El Teir ITarawan section, the WT boundary interval is characterized by a phosphatic conglomerate band.