7/29/2023 0 Comments Rainbow obsidian palm stone![]() The site was designated a National Historic Landmark in 1996. It was listed on the National Register in 1982. The kiosk at Obsidian Cliff, constructed in 1931, was the first wayside exhibit in a US national park. Staff are now researching the intensity of use of this obsidian, both within the park and across North America. Those surveys added substantially to knowledge about how obsidian was mined from the bedrock and collected as cobbles from the overlying glacial till. The fire did not damage the cliff face, but it cleared the surface, creating optimal conditions for archeological surveys. Obsidian Cliff is the primary source of obsidian in a large concentration of Midwestern sites, including about 90% of obsidian found in Hopewell mortuary sites in the Ohio River Valley (about 1,850–1,750 years ago).Ībout 90% of the forest on Obsidian Cliff plateau burned in 1988.It is found along trade routes from western Canada to Ohio. ![]() It is the United States’ most widely dispersed source of obsidian by hunter-gatherers.Obsidian was first quarried from this cliff for toolmaking more than 11,000 years ago. ![]()
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