الفهرس 
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Abstract
Sedimentological study on the Late Cretaceous/Early Tertiary succession near Qena region, helped in clarifying t h e depositional history of the area. Grain-size analysis, petrographic examination and X-ray diffraction studies have proved to be a useful tools in identifying the factors most influencing sediment transportation and the processes involved during their deposition. Most of the data of the grain-size parameters of the Nubian Sandstone point t o an aeolian origin, although a variety of depositional environments (aeolian, river and beach environment) is deduced. Nevertheless, the present study suggests that the Nubian Sandstone is a near-shore sediments deposited by both aeolian and aqueous processes. The d e c r e a s e in the degree of reliability of grain-size analysis may be attributed t o the role of diagenetic processes in modifying grain-size distribution of the Nubian Sandstone.