Black and white lantern slide of the Liberty Cap rock formation in Yellowstone National Park.

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 old lava flow formations near Soda Butte Creek.

Black and white lantern slide of Obsidian Cliff, Wyoming.

Black and white lantern slide of old lava flows on Purple Mountain in Colorado.

Black and white lantern slide of a lava cap south of Pocatello, Idaho, with a railroad and road in the mid and foreground.

Black and white lantern slide showing construction equipment and work on the Deer Creek Dam in Utah.

Black and white lantern slide of mountains at Dinosaur National Monument showing the jurassic era geologic folds.

Black and white lantern slide of a mountain in the Uinta Mountain range.