Mount Konocti, a twin-peaked complex dacitic volcano of Pleistocene age on the south-central shore of Clear Lake, is the most prominent feature of the Clear Lake volcanic field. Wright Peak (left) is a rhyodacitic and dacitic lava dome with associated lava flows, and Buckingham Peak (right) is composed of dacitic lava flows capped by an eroded basaltic-andesite cinder cone. The flat ridge extending across the photo in front of Mount Konocti is a peninsula of Cretaceous-Jurrasic rocks of the Franciscan formation.

Photo by Lee Siebert, 1967 (Smithsonian Institution).

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

Clear Lake Volcanic Field