Thin section of a rich oil shale showing several relatively large concretions and an abundance of minute concretions, all of micro granular carbonates; Rio Blanco County, Colorado. 1925
Dates
Date Taken
1925
Summary
Thin section of a rich oil shale showing several relatively large concretions and an abundance of minute concretions, all of micro granular carbonates; enlarged 10 times. Rio Blanco County, Colorado. July 27, 1925. Plate 17-A, U.S. Geological Survey. Professional paper 168. 1931.
Summary
Thin section of a rich oil shale showing several relatively large concretions and an abundance of minute concretions, all of micro granular carbonates; enlarged 10 times. Rio Blanco County, Colorado. July 27, 1925. Plate 17-A, U.S. Geological Survey. Professional paper 168. 1931.
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