Black and white photograph looking northwest along Abbot's Brook in Trenton, New Jersey, near Argillite site.

Black and white photograph of an exposed strata along Crane Creek. Three men are visible in the photograph, with two standing next to the strata and one man working in the strata.

Black and white photograph of chalcedony quarry site #1 looking west in Amarillo, Texas. An automobile and a person are visible in the background.

Shoemaker Ranch near Folsom, New Mexico: Lower hearths looking northwest. A man is visible squatting in the middle of the Lower hearths.

Black and white photograph of a glacial groove in Silurian Diabese on Mount Washington. Scattered rocks and stone are visible between two large boulders with field grasses in the background.

Black and white photograph of the cliff face of the Black slate folded cliff from below.

Black and white photograph of a woman standing in a rocky gorge.

Black and white photograph of a gulley from above. A cactus is visible on the right side of the frame.

Black and white photograph of a cliff face.

Black and white photograph of a gulley with tents visible in the distance.

Black and white photograph of a man standing next to a rock wall, or "knob," in Little Falls, New York.

Black and white photograph of a rock cliff face.