"About half of Earth’s geysers are located in Yellowstone National…
On this day 150 Years ago! (August 27, 1871)
The Hayden group arrived at Bottler’s Ranch after 38 days exploring the heart of the future national park.
(In Burning Ground, Graham travels south with Makawee and Rides Alone to Obsidian Cliff).
Because it can be honed to an exceptionally thin edge, the volcanic glass known as obsidian was first quarried from this cliff for toolmaking more than 11,000 years ago.
This site – in the northwest section of Yellowstone National Park – was listed on the National Register in 1982 and designated a National Historic Landmark in 1996.