Deer Mountain is a post caldera rhyolite that erupted outside the L...
By Volcano Hazards Program
1989 (approx.)
![Deer Mountain is a post caldera rhyolite that erupted outside the L...](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/vhp_img280.jpg?itok=n4ubsUW-)
Detailed Description
Deer Mountain is a post caldera rhyolite that erupted outside the Long Valley Caldera about 115,000 - 97,000 years ago.
Sources/Usage
Public Domain.