Geology
Mono County, CA
Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Young rhyolite–obsidian lava dome in the Inyo volcanic chain west of US-395 north of Mammoth Lakes. Short walks from dirt-road parking reach glassy black flow fronts, pumice, and explosion-crater terrain — a textbook Long Valley / Inyo Craters field-trip stop managed by Inyo National Forest.
| Region | Mono County, CA |
|---|---|
| Coordinates (approx.) | 37.7590, -119.0206 |
| Geology | Rhyolite–obsidian lava dome |
| Elevation | ~8,500 ft summit class |
| Access | Glass Flow / Obsidian Dome Rd off US-395 |
| Manager | Inyo National Forest |
Public recreation data — BLM & Recreation.gov (RIDB). Verify current access, fees, and seasonal closures before traveling.
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Plan ahead. Leave no trace. Verify current access before traveling.