RIVER NIGER, THE OLDEST RIVER IN AFRICA WITH THE LARGEST DELTA IN THE WORLD.
SUBSURFACE MORPHOLOGY AND GEOARCHAEOLOGY REVEALED BY SPACEBORNE AND AIRBORNE RADAR Copyright ©1986 James J. Hurtak, Ph.D. AFFS Corporation, Los Gatos, CA 95031 USA www.affs.org ABSTRACT The shuttle imaging radar (SIR-A) carried on the Space Shuttle Columbia (November 1981) penetrated the dry Selima Sand Sheet, subsurface valleys and arid desert wastelands of the eastern Sahara, revealing previously unknown buried valleys and channels, unusual geologic structures, and possible Stone Age occupation sites, not detectable by Landsat. The calculated depth of radar penetration of dry sand and granules, based on laboratory measurements of the electrical properties of samples from the area extends, in some instances, to a depth of 6 meters. Field studies in Egypt verified SIR-A signal penetration depths of at least 1 meter in the Selima Sand Sheet and in drift sand and several meters in sand dunes. Subsurface findings at various locations from Kom Ombo to the Chad-Sudanese border