Concentric banding and faint bedding shown in polished and etched faces of an opal concretion from the same locality as photo 14. San Luis Obispo County, California. 1931.
Dates
Date Taken
1931
Summary
Concentric banding and faint bedding shown in polished and etched faces of an opal concretion from the same locality as photo 14. San Luis Obispo County, California. 1931. Plate 7-C, in U.S.Geological Survey Professional paper 212. 1943.
Summary
Concentric banding and faint bedding shown in polished and etched faces of an opal concretion from the same locality as photo 14. San Luis Obispo County, California. 1931. Plate 7-C, in U.S.Geological Survey Professional paper 212. 1943.
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