A ~15,500-year-old tuff cone that erupted under rising Lake Bonneville in the Black Rock Desert. Wave-cut beaches and the famous white “Lace Curtain” cliff expose palagonitized ash; UGS GeoSights highlights the underwater Surtseyan eruption story and fault-fed volcanism still active in the field (young basalt flows nearby).
Field facts
| Region | Millard County, UT |
|---|---|
| Coordinates | 39.1313, -112.5516 |
| Access | Clear Lake Bird Refuge road east from SR-257 south of Delta, then signed spur toward the butte (UGS directions) |
| Rock | Basaltic tuff cone with Bonneville-level wave-cut shelf and palagonite |
| Agency | BLM public lands / adjacent Clear Lake refuge corridor |
| Also called | Pavant Butte, Sugarloaf |
Nearby locations
Nearby amenities
- Rec areaDominquez Escalante Trail12.3 km away
- Point of interestSunstone Knoll Rockhounding Area14.6 km away
Public recreation data — BLM & Recreation.gov (RIDB). Verify current access, fees, and seasonal closures before traveling.
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