Graduate student Bob Kopp stands on the rhyolite dome of Panum Crater, the northernmost in the Mono Crater chain, near Lee Vining, California. This crater erupted about 600 years B.P. The linear foothills of the Sierras in the distance are lateral moraines of the glaciers that once flowed down these flanks. The last glaciers in this area disappeared around 11,000 years B.P. Volcanic and glacial deposits were two major topics of the November 2003 Ge 112 field trip, during which this photo was taken.

Photo courtesy of Belle Philibosian