S72-48854 (6 Sept. 1972) --- Two members of the prime crew of the Apollo 17 lunar landing mission examine rock specimens during lunar surface extravehicular activity simulation training on a geological field trip to the Pancake Range area of south-central Nevada. They are astronaut Eugene A. Cernan (right), commander; and scientist-astronaut Harrison H. Schmitt, lunar module pilot. They are standing on the rim of Lunar Crater, which is about 600 feet deep and five-eighths of a mile in diameter. It is a volcanic crater.