Geology
Tuolumne County, CA
Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
A short interpretive trail off Highway 108 reaches a cliff of multi-sided basalt columns formed when lava pooled in an ancestral Stanislaus riverbed and cooled into joints. A later glacier carved the valley and left the columns and a talus slope next to Pigeon Flat Campground.
| Region | Tuolumne County, CA |
|---|---|
| Coordinates (approx.) | 38.3399, -119.8056 |
| ARPA | Cultural sites and artifacts are protected by federal law (ARPA/NHPA) — stay on established routes, touch and remove nothing, and follow the managing agency's and the affiliated tribe's guidance on access. |
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Plan ahead. Leave no trace. Verify current access before traveling.