The Obsidian Cliffs

The Obsidian Cliffs. Stone from these cliffs is found as far east as the Hopewell Mounds in Chillicothe, Ohio, dating to 400 A.D. indicating extensive pre-historic native American trade routes across North America.

Photo Location: Wyoming, Yellowstone National Park
Photo Date: 2011 June 28

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Author: Dr. David Goodrich, NOAA (ret.)/ NOAA

License: Public Domain Mark 1.0 (Public domain)

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