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

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 of a man leaning against a wall of stone at the East fork of Greenwood Creek.

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

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

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

Black and white lantern slide copy of a sketch map showing moraines around the west end of Lake Ontario, with surrounding text from an unidentified publication.

Black and white lantern slide copy of a sketch map of the vicinity of Lake Ontario showing physiographic divisions, with surrounding text from an unidentified publication.

Black and white lantern slide copy of a sketch map showing Lake Tonawanda and spillways from it to glacial Lake Iroquois, with surrounding text from an unidentified publication.

Black and white photograph of a cliff face next to water. "A Panama Slide." is written on the bottom of the image.

Black and white photograph of a man standing atop a drumlin, or hill formed of rock debris. Likely taken near Clinton, New York.

Black and white photograph of a hillside covered with field grass and shrubs in Otsego County, New York. Shale outcroppings jut out from the hillside, partially obscured by foliage.

Black and white photograph of a small mountain in Otsego County, New York. Rock outcroppings jut out from the grassy hillside.

Black and white close-up photograph of a brook near Lake Otsego, New York. Flat slabs of marcellus shale line the bed of the brook.

Black and white photograph of a rock cliff face.

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 gulley with tents visible in the distance.

Black and white photograph of a cliff face.

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 woman standing in a rocky gorge.