Obsidian rock from Obsidian Cliff, YNP.

Obsidian rock from Obsidian Cliff, Yellowstone National Park....

Detailed Description

Close view of rocks from from Obsidian Cliff. This outcrop exposes the interior of a thick rhyolite lava flow erupted about 180,000 years ago.

Details

Image Dimensions: 800 x 500

Date Taken: