Obsidian Cliff, Yellowstone national park
Genuine Curteigh-Chicago "C.T. Art-Colortone" Post Card
Obsidian Cliff, Yellowstone Park, is on the Mammoth-Norris Road 12.3 miles from Mammoth Hot Springs. This volcanic glass brought Indians to the region in the early days for arrowhead material as the pipestone country of Minnesota attracted Indians to its quaries.