Global Volcanism Program | Image GVP-03282
Flow-banded rhyolitic obsidian of the Panum Crater lava dome was erupted about 600 years ago at the northern end of the Mono Craters. The greenish-yellow areas are lichens on the surface of the dome.
Photo by Lee Siebert, 1973 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.