Win a relaxing weekend stay for two at Barnsley Gardens Resort
Home

Longstreet Highroad Guide to the California Sierra Nevada

By Mark Grossi

Design by Lenz, Inc. Decatur, Georgia.



California Sierra Nevada > Sidebars > Long Valley Caldera

Long Valley Caldera

In the Owens Valley, against the steep escarpment of the Sierra, the Long Valley Caldera is a huge depression caused by a massive volcanic blast more than 700,000 years ago. The blast sent out 140 to 150 cubic miles of lava, buried everything for more than 300 square miles, and left the 19-mile-long and 10-mile-wide depression that is still visible today. Why was this blast so big? Chemistry played a big part, scientists say. The rhyolite found in the Bishop Tuff is almost three-fourths silica, which is dense and does not flow easily. This thick magma has the capacity to capture more gases. The gases build in the magma. In the case of Long Valley Caldera, their release was an epic explosion.


Read and add comments about this page


Reader-Contributed Links to the California Sierra Nevada Book:

[an error occurred while processing this directive]
[ | Online Guides | Buy the Book | About Sherpa Guides | Credits ]
Published (print): 2000, Published (Web): September 2000, Revised (Web): November 2002, ISBN: 1-56352-592-5
Visit some of our other sites:
The Weekly Check-Up with Dr. Bruce Feinberg | Tall Rockers | Atlanta SEO