Geology
Millard County, UT
Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
A glowing white dome of Oligocene Tunnel Spring Tuff in the Wah Wah Mountains—an inverted volcanic ash-flow valley filled with crystal-rich rhyolite tuff, fretted with giant tafoni honeycomb weathering. Utah Geological Survey GeoSights highlights the double-terminated quartz crystals and Basin-and-Range fault history that left this resistant peak standing alone.
| Region | Millard County, UT |
|---|---|
| Coordinates (approx.) | 38.7965, -113.5962 |
| Access | Gravel Crystal Peak / Black Rock roads west of SR-257 between Delta and Milford (UGS directions) |
| Rock | Tunnel Spring Tuff (rhyolitic ash-flow tuff) with quartz, sanidine, plagioclase |
| Agency | BLM public lands (no developed facilities) |
| Visitor pin | UGS GeoSights approach coordinates |
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.