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

Black and white lantern slide close-up view of petrified trees in the grass with measuring sticks.

Black and white lantern slide of Audie Merrill posing on a hillside next to a fenced-in petrified tree. Two other people, Sinclair and Virginia, are visible through the fence.

Black and white lantern slide of old lava formations on Amethyst Mountain in Wyoming.

Black and white lantern slide of Obsidian Cliff, Wyoming.

Black and white photograph of a stone pillar. The image is somewhat blurry.

Black and white photograph of a mountain partially covered with trees.

Black and white photograph of a mountain partially covered with trees.

Black and white photograph of a road next to a mountainside with a mountain range visible in the distance.

Black and white photograph of Gibbon Falls in Yellowstone National Park. Gibbon Falls is surrounded by mountains and forest.

Black and white photograph of the Fountain Geyser at Yellowstone National Park. Steam is rising from the geyser, and a pine tree stands between the geyser and the photographer.

Black and white close-up photograph of Punch Bowl Spring in Yellowstone National Park.