The recent article by Jean-Claude Mareschal (“Plate Tectonics: Scientific Revolution or Scientific Program?” in Eos, May 19, 1987, p. 529) adds to the interesting literature on the evolution of the theory of plate tectonics. It is curious that an aspect of the general theory that seems to be little considered and mentioned by Mareschal or others who write about the history of development of the theory, but that was vitally important in my own acceptance of the theory, was the discovery of subduction and, to a lesser extent, abduction.
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