Utilization of A S f P Photographs in the Study of Small Structures in Abu Rawssh and WIdi el NatrQn , Egypt

This paper deals with a study of geologic structures using 8 X enlargements of Apollo-Soyuz Test Project color photographs. The two study areas are Abu Rawdsh and Whdi el NatrQn; both are in the northern part of the Western Desert of Egypt. Because the structures are small, aerial photographs were studied and field checks were made to verify the findings from Apollo-Soyuz photographs. The Apollo-Soyuz photographs of Abu Rawhsh clearly show structural uplifts that brought white chalk deposits to the surface. The photographs also depict the distribution of dark volcanic rocks in the region and clearly delineate complex structures including several domes and plunging anticlines. Differences and similarities between these structures are clearly displayed in the ApolloSoyuz photographs. Wddi el NatrOn is an elongate depression that is probably tectonic in origin. The Apollo-Soyuz photographs display its structures as well as the string of salt lakes within it. The natural color of these photographs enables distinction between these lakes on the basis of color. Natural color also enables recognition of the barren nature of the northern and southern extremities of the depresa ~ i n Shams University, Cairo, Egypt. b ~ a t i o n a i Air and Space Museum, Smithsonian