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Dr. Francis P. Shepard, the father of marine geology, discussing scientificfindings of the International Indian Ocean Expedition on board the Coast andGeodetic Survey Ship PIONEER at a press conference in Colombo, Ceylon. Lookingon were Dr. Robert Dietz, an early pioneer in plate tectonic theory, and Dr.Harris B. Stewart, Chief Oceanographer of the Coast and Geodetic Survey. (Image credit: Archival Photography by Steve Nicklas)