Black and white lantern slide of clay varves, or laminated sediment, along the Gibbon River in Wyoming.

Geyser cones at Yellowstone National Park, Wyoming.

Geyser cone at Yellowstone National Park, Wyoming.

Devil's Tower, Wyoming.

Devil's Tower, Wyoming.

Devil's Tower, Wyoming.

Castle Geyser in eruption at Yellowstone National Park, Wyoming.

Canyon below Shoshone Dam, Wyoming.

Camping in the Bighorn Mountains in Wyoming.

Bridge over Yellowstone River above the falls at Yellowstone National Park, Wyoming.

Boiling Spring at Yellowstone National Park, Wyoming.

Black and white photograph of two bears by the Fountain Hotel, Yellowstone National Park.