Global Volcanism Program | Image GVP-03295
The unvegetated Glass Creek lava flow on the left and Obsidian Flow on the right are among a group of obsidian lava flows and domes that were emplaced during a major eruption from the Inyo Craters about 600 years ago. The eruption, originating from a shallow dike, began with powerful explosive activity, pyroclastic flows, and a series of phreatic explosions, and ended with effusion of the lava domes and flows.
Photo by Larry Mastin, 1991 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.