Photomicrograph showing tonalitic gneiss that contains large round plagioclase (pla) crystals embedded in fine-grained biotite-plagioclase gneiss. Clearwater County, Idaho. circa 1950.
Dates
Date Taken
1950
Summary
Album caption: Photomicrograph showing tonalitic gneiss that contains large round plagioclase (pla) crystals embedded in fine-grained biotite-plagioclase gneiss. Clearwater County, Idaho. From railroad cut 2 miles west of Ahsahka. c. 1950. Published as figure 61C in U.S. Geological Survey. Professional paper 344-A. 1962.
Summary
Album caption: Photomicrograph showing tonalitic gneiss that contains large round plagioclase (pla) crystals embedded in fine-grained biotite-plagioclase gneiss. Clearwater County, Idaho. From railroad cut 2 miles west of Ahsahka. c. 1950.
Published as figure 61C in U.S. Geological Survey. Professional paper 344-A. 1962.
Available in the U.S. Geological Survey Denver Library Photographic Collection, Hietanen, A.M. Collection.
Rights
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