Point Reyes National Seashore

Older Quaternary alluvial gravels of the Olema Formation overlie weathered Franciscan bedrock along Highway 1 south of the intersection of Bolinas-Olema Road along Bolinas Lagoon. The age of the gravels is about 55,000 years based on correlation of volcanic ash found in this unit (analysis by Andrei Sarna-Wojcicki, USGS).

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Last modified: 1/18/2011