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Dr Harbaugh's guest is Dr. Stanley Davis, assistant professor of geology at Stanford University. A graduate of the University of Nevada with a M.S. from the University of Kansas and a Ph.D. from Yale, he has also worked with the U.S. Bureau of Reclamation and the Kansas and Missouri Geological Surveys. Dr. Davis makes his own rocks on this program. In doing so, he demonstrates how nature is able to make solid rock through the copaction of clays, sands, and silts under great pressure. They discuss the part of North America which although now dry land was once part of the ocean.
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