SciencepaleochannelsSahelShuttle Radartgbookref science-218-4576-shuttle-radar-sahel-buried-channels Subsurface Valleys and Geoarcheology of the Eastern Sahara Revealed by Shuttle Radar The shuttle imaging radar (SIR-A) carried on the space shuttle Columbia in November 1981 penetrated the extremely dry Selima Sand Sheet, dunes, and drift sand of the eastern Sahara, revealing previously unknown buried valleys, geologic structures, and possible Stone Age occupation sites. By J. F. McCAULEY, et al. Dec 3rd, 1982 Next