41C-39-1973 (6-13 April 1984) --- Though photographed on previous manned spaceflights, the Richat Structure in Western Mauritania has seldom if ever been able to be seen more clearly and studied more completely than in this 41-C 70mm frame, according to geologists. The structure is actually a 25-mile wide, 1,000-ft. deep hole in the Earth, the result of heavy wind erosion. This frame was one of the visuals used by the 41-C astronauts at their April 24, 1984 post-flight press conference.