Geology
Rio Arriba County, NM
Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Flat-topped volcanic landmark of the northern Jemez country, famous as Georgia O’Keeffe’s recurring mountain and named for the Pedernal Chert once quarried for stone tools. ~8 Ma andesite-basalt caprock over Mesozoic strata at the Colorado Plateau–Rio Grande rift transition; public USFS approach via Forest Roads 100/160.
| Region | Rio Arriba County, NM |
|---|---|
| Coordinates (approx.) | 36.1628, -106.5034 |
| Elevation | 9,862 ft summit |
| Geology | Miocene lava cap; Pedernal Chert; rift-margin structure |
| Cultural | O’Keeffe subject; prehistoric chert source |
| Access | Santa Fe NF roads / hike from Temoline Canyon |
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.