A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Jumble of obsidian and pumice, Obsidian Dome, just north of Mammoth Lakes, California, USA |
|---|---|
| Description | Obsidian Dome is a 600 year old (very young!) rhyolite dome near Mammoth Lakes in eastern California. It formed by rapid cooling of a viscous lava having the composition of a granite. The inner parts are relatively solid rhyolite, but the outer parts are a jumbled mass of boulders and rocks of various sizes. Much of the material is pumice and/or volcanic glass. A plaque near the dome says, “This mile-wide, 300 foot high rhyolite dome is one of a chain of similar domes extending from Mono Lake to the Inyo Craters. The domes in the northern two-thirds of the chain are known as the Mono Craters.” |
| Chronostratigraphy | recent |
| Geologic province | Inyo Volcanic Field |
| Location | USA ▹ California ▹ Mono. Near Mammoth Lakes. Inyo National Forest. |
| Photographer | Dexter Perkins. 2001-05-22. |
| Collection | E121016991F. |
| Key words | rhyolite, obsidian, pummice, granite, dome |
| Tech details | 553 KB. Outcrop. Canon Eos Rebel, 55 mm lens, Fuji Sensia 100. |
| GeoDIL number | 560 |
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