Skip to main content
U.S. flag

An official website of the United States government

Mammoth Mountain, CA, viewed from the east. Devil's Postpile (botto...

By Volcano Hazards Program 1905 (approx.)
Mammoth Mountain, California, viewed from the east. Devil's Postpil...
Original Thumbnail Medium

Detailed Description

Mammoth Mountain, California, viewed from the east. Devil's Postpile (bottom) is a single lava flow of the Mammoth Mountain Complex that flowed into a canyon and cooled 82,000 years ago.