Random Roadcuts #4: US-385 near Wind Cave National Park, South Dakota
20:02
Random Roadcuts #8: Hoover Dam, Nevada
23:36
"Old" Yellowstone in southern Idaho: amazing deposits of pyroclastic flows from explosive eruptions
31:13
Random Roadcuts #1: US 93 in the Schell Creek Range of eastern Nevada
23:15
Random Roadcuts #6: Central Nevada on US-6
13:32
I Climbed Through This Hole To Find a Hidden Ancient Civilization
14:06
Spectacularly Large Crystals in Black Hills Pegmatite: The Geologic Story
25:39
Random Roadcuts #3: US-189 near Kemmerer, Wyoming
16:47