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What are the remains of marine animals found on mountain tops? Obviously, says Dr. Harbaugh, in the mountains there is material that was once on the bottom of the sea. In describing the process of mountain building, Dr. Harbaugh turns to the Appalachians and retraces the rise of these heights form a shallow sea that once lay in the eastern US. His guest is Dr. Robert R. Compton, associate professor of geology at Stanford University who has conducted research for the US Geologic Survey and has spent many years making detailed geologic maps of over 1,200 square miles in California.
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