A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Pumice boulder, Obsidian Dome, just north of Mammoth Lakes, California, USA |
|---|---|
| Description | This is a large piece of pumice from Obsidian Dome, a 600 year old (very young!) rhyolite dome near Mammoth Lakes in eastern California. Obsidian Dome formed by rapid cooling of a viscous lava, and today consists of a jumbled mass of boulders and rocks of various sizes. Many, like this one, are made of pumice and/or volcanic glass. The overall composition of Obsidian Dome is the same as a rhyolite (fine grained extrusive igneous rock) and a granite (coarser grained intrusive igneous rock) but cooling was very rapid, and so much glass and pumice formed. |
| Chronostratigraphy | recent |
| Geologic province | Inyo Volcanic Field |
| Location | USA ▹ California ▹ Mono. Near Mammoth Lakes. Inyo National Forest. |
| Photographer | Dexter Perkins. 2001-05-22. |
| Collection | E151021992F. |
| Key words | Obsidian Dome, obsidian, pumice |
| Tech details | 564 KB. Outcrop. Canon Eos Rebel, 55 mm lens, Fuji Sensia 100. |
| GeoDIL number | 540 |
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