He was elected a Fellow of the American Academy of Arts and Sciences in 1975 .
He is a member of the American Association for the Advancement of Science , the American Geophysical Union , and the Geological Society of America .
member was elected a Fellow of the American Academy of Arts and Sciences in 1975 .
He is a member of the American Association for the Advancement of Science , the American Geophysical Union , and the Geological Society of America .