The Sugarloaf Mountain lava dome and associated lava flows, seen here from the west, is the largest of 38 rhyolitic lava domes of the Coso volcanic field, rising 300 m above its base. The high-silica rhyolite of Sugarloaf Mountain contains localized areas of obsidian that were used as a source of arrowheads for native Americans. The dome has been dated at about 41,000 ± 21,000 years and is one of the youngest volcanic vents at Coso.

Photo by Lee Siebert, 1997 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Coso Volcanic Field