Sheepeater Cliff, in Yellowstone National Park
By Yellowstone Volcano Observatory
2003 (approx.)
![Sheepeater Cliff, in Yellowstone National Park](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/Sheepeater%20cliff%20columns.jpg?itok=VVT8nPIe)
Detailed Description
Slow cooling of a basaltic lava flow that was erupted about 500,000 years ago resulted in the formation of hexagonal columns at Sheepeater Cliff, in Yellowstone National Park.
Sources/Usage
Public Domain.