Yellowstone's Obsidian Cliff: its amazing geologic story

Geology professor Shawn Willsey takes you up close and personal with the famous Obsidian Cliff in Yellowstone National Park. Learn more about how the silica-rich lava flow that formed this interesting rock. Support geology education via: PayPal: https://www.paypal.com/donate/?hosted... or Buy Me: https://buymeacoffee.com/shawnwillsey or Venmo: @shawn-willsey or click on the three dots below the viewer then "Thanks" or a good ol' fashioned check to: Shawn Willsey 148 Blue Lakes Blvd N #141 Twin Falls, ID 83301