Obsidian Cliff

Outcropping of Volcanic Glass

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Small pieces of obsidian, a black volcanic glass, are dispersed across much of Yellowstone National Park, but Obsidian Cliff is composed largely of the unique rock. The material was a favorite of Native Americans for making a arrowheads and other tools because it is easy to use, and it naturally produces very sharp edges.

In 1996 it was declared a National Historic Site due to its significance in Native American history. 

Obsidian was first quarried from this cliff for toolmaking more than 11,000 years ago and gradually spread along trade routes from western Canada to Ohio… It is the United States’ most widely dispersed source of obsidian by hunter-gatherers.
National Park Service
Obsidian Cliff
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