Rainbow Mountain (California)

About

Rainbow Mountain is a stratovolcano at the southern end of the Cascade Range in Siskiyou County, California. It is located between Mount Shasta and the Medicine Lake Volcano, consisting of andesitic and dacitic rocks that were produced during the Early Pleistocene subepoch. Its last known eruption is also of Pleistocene age.

Adapted from Wikipedia (CC BY-SA). Photography via Wikimedia Commons.