Negit Island, capped by the dark-colored cinder cone at the right, was the source of one of the most recent eruptions of the Mono Lake volcanic field. Rhyodacitic lava flows overlie a 1240 CE tephra unit. The light-colored tufa deposits near the western shore of Mono Lake in the foreground were created by deposition of calcium carbonate beneath the waters of the lake.

Photo by Lee Siebert, 1973 (Smithsonian Institution).

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

Mono Lake Volcanic Field