Black and white photograph of anticline rocks near Ontario, Canada. Taken by Robert Merrill, looking north across water. Water damage is visible on the image, which was scanned from the negative.

Rock formation near Lees Ferry, Arizona.

Black and white photograph of a horse-drawn coach in the Hoodoos, Yellowstone National Park. Five people are visible sitting on the coach.

Black and white photograph of Hanging Rock at the Pikes Peak Cog Railway.

Black and white photograph of Hymen Terrace, Yellowstone National Park. Two women can be seen standing in the foreground of the image.

Black and white photograph of Jupiter Terrace, Yellowstone National Park. Taken by Robert Merrill from above. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of Lena Billington Merrill standing below Point Lookout, Yellowstone National Park.

Black and white lantern slide of a slope of rock fragments, or talus, taken from a roadside in Mexico.

Black and white lantern slide of Mexican mountainsides taken from the roadside.

Black and white lantern slide of Mexican mountainsides taken from the roadside.

Glacial action on rock in Marquette, Michigan.

Black and white lantern slide of eroded rocks and cliffside at the beach in Ingonish, Nova Scotia.