United States of America
Obsidian Cliff, also known as 48YE433, was an important source of lithic materials for prehistoric peoples in Yellowstone National Park near Mammoth Hot Springs, Wyoming, United States. The cliff was named by Philetus Norris, the second park superintendent in 1878. It was declared a National Histori
Listen to the audio guide for Obsidian Cliff Kiosk Free on WIP — starts by itself when you arrive, even with the screen off