Obsidian Cliff

Also known as: 48YE433
Approx. 13 mi. S of Mammoth;E. side of US 89, S. of ObsidianCliff Kiosk, Mammoth, Wyoming


Obsidian Cliff Kiosk

Photo from the Historic American Buildings Survey

View photos at Library of Congress



Obsidian Cliff occupies a unique position in national prehistory as a singularly important source of lithic materials for prehistoric peoples of interior western North America. It is recognized as an exceptionally well preserved, heavily utilized lithic source that served the utilitarian needs and ceremonial requirements or early indigenous peoples over a large area of North America for 12,000 years. -- National Historic Landmark statement of significance, June 19, 1996

National Register information 

Posted to the National Register of Historic Places on June 19, 1996
Reference number
Areas of significance
Archeology - Prehistoric; Commerce; Industry
Level of significance
Evaluation criteria
A - Event; D - Information Potential
Property type
Historic functions
Processing site; Trade (archeology)
Current functions
Natural feature; Outdoor recreation
Periods of significance
9000-10999 BC; 7000-8999 BC; 5000-6999 BC; 3000-4999 BC; 1000-2999 BC; 1000 AD-999 BC; 1499-1000 AD; 1749-1500 AD; 1900-1750 AD