Yellowstone — Obsidian CliffPlains Nations Mythology

Obsidian Cliff in Yellowstone is one of the most significant lithic source sites on the continent — a massive exposure of volcanic glass (obsidian) that was quarried and traded across North America for at least 11,000 years. Obsidian from this specific cliff has been identified in archaeological sites from Ohio to the Pacific Coast, from Alberta to Texas. It was not merely a raw material — obsidian was a substance of spiritual power.

For the Shoshone (Eastern Shoshone, or Tukudika — the 'sheep eaters' of the Yellowstone high country), the entire Yellowstone plateau was home territory, not a wilderness to be avoided. The geothermal features — geysers, hot springs, fumaroles — were understood as living expressions of spiritual power, places where the earth's interior was visible and active. Obsidian Cliff was part of this sacred landscape.

The Crow, Blackfeet, Bannock, and Nez Perce also had deep connections to the Yellowstone region. The Crow call the Yellowstone area 'the land of the burning ground' and their oral traditions describe the geothermal features as places of power and danger. The Blackfeet associated the geysers with spiritual beings. Far from the popular myth that Native peoples avoided Yellowstone out of fear, the archaeological record shows continuous, intensive use of the plateau for over 11,000 years.

Obsidian Cliff is a 150-foot-high exposure of volcanic glass along the Grand Loop Road between Mammoth Hot Springs and Norris Geyser Basin in Yellowstone National Park. The cliff was formed roughly 180,000 years ago by a rhyolite lava flow. The obsidian is jet-black, glassy, and visible from the roadside pullout. A National Historic Landmark marker identifies the site.

Yellowstone itself sits atop one of the largest active volcanic systems on Earth — the Yellowstone Caldera, which last erupted catastrophically 640,000 years ago. The geothermal features (geysers, hot springs, fumaroles, mud pots) are surface expressions of a magma chamber lying roughly 5 miles below the surface.

Peter Nabokov and Lawrence Loendorf's 'Restoring a Presence: American Indians and Yellowstone National Park' (2004) is the definitive study of Indigenous connections to Yellowstone. The authors document extensive evidence of continuous Native American use of the park area, challenging the 19th-century myth — propagated to justify the creation of the park as an 'uninhabited wilderness' — that Indians feared the geothermal features and avoided the plateau.

Obsidian from the Yellowstone source has been geochemically fingerprinted and identified in archaeological contexts across the continent, documenting trade networks spanning thousands of miles. Obsidian Cliff was designated a National Historic Landmark in 1996, one of the few such designations recognizing a site's significance to precontact Indigenous peoples. The Shoshone, Crow, and other tribal nations continue to advocate for greater recognition of their ancestral connections to Yellowstone.