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Markes E. Johnson has been interested in marine geology since fossils in Paleozoic limestone first caught his eye as a boy. He is presently Charles L. MacMillan Professor of Geology at Williams College, whose students he has been introducing to Baja California's ancient shorelines for more than a decade. Jorge Ledesma-Vázquez is Associate Dean of the Facultad de Ciencias Marinas, Universidad Autónoma de Baja California natu ral histo ry / ecology (UABC), Ensenada in Mexico.
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