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Co-Chief Scientist Felix Gradstein (left) of the Bedford Institute of Oceanography, Dartmouth, Canada and Robert Sheridan of the University of Delaware on the forward deck near the drilling rig on board the D/V Glomar Challenger (ship) during Leg 76 of the Deep Sea Drilling Project. 1980.

Co-Chief Scientist Felix Gradstein (left) of the Bedford Institute of Oceanography, Dartmouth, Canada and Robert Sheridan ...