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Ancient Nile River Mud Core - William B.F. Ryan, left, of Columbia University's Lamont-Doherty Geological Observatory, and Kenneth J. Hsu, center of the Swiss Federal Institute of Technology in Zurich, show Travis Rayborn, of Global Marine Inc., a core of ancient Nile River abyssal sediment recovered on the Mediterranean Sea Ridge during Leg Thirteen of the Deep Sea Drilling Project. Ryan and Hsu were cruise-co-chief scientists, while Rayborn was drilling superintendent for the Glomar Challenger drilling and coring crews. 1970

Ancient Nile River Mud Core - William B.F. Ryan, left, of Columbia University's Lamont-Doherty Geological Observatory, and...