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Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology Field Expedition Instructor, Ed Williams with students at Yellowstone Falls.Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Geology field trip to Yellowstone Wyoming in 1993Students on the way to Specimen Ridge to view the petrified trees.Students pose near a petrified tree on Specimen Ridge in Yellowstone National Park.Old Faithful erupts in Yellowstone National Park.Students pose next to bear claw scratches on the way to Specimen Ridge.Students crossing Lamar Valley in Yellostone National Park.Geology field trip to Yellowstone Wyoming in 1993