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.
Field facts
| Region | Millard County, UT |
|---|---|
| Coordinates | 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 |
Nearby locations
Nearby amenities
Public recreation data — BLM & Recreation.gov (RIDB). Verify current access, fees, and seasonal closures before traveling.
Map preview
Explore the area
The interactive map and its tiles load only when requested.