Ellipsoidal basalt intrusive into thin-bedded radiolarian chert of San Francisco Group, Hunter Point, the layers of chert are much contorted by the intrusion.
Dates
Date Taken
1913
Summary
Ellipsoidal basalt intrusive into thin-bedded radiolarian chert of San Francisco Group, Hunter Point, the layers of chert are much contorted by the intrusion. San Francisco County, California. 1913. Plate 6 in U.S. Geological Survey. Folio 193. 1914.
Summary
Ellipsoidal basalt intrusive into thin-bedded radiolarian chert of San Francisco Group, Hunter Point, the layers of chert are much contorted by the intrusion. San Francisco County, California. 1913. Plate 6 in U.S. Geological Survey. Folio 193. 1914.
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