Decomposition boulders formed by vein making agencies in granite, Gagnon mine. Jefferson County, Montana. 1900.
Dates
Date Taken
1900
Summary
Decomposition boulders formed by vein making agencies in granite; north crosscut, 800 foot level, Gagnon mine. Jefferson County, Montana. Circa 1900. Plate 6-A in U.S. Geological Survey. Professional paper 74. 1912.
Summary
Decomposition boulders formed by vein making agencies in granite; north crosscut, 800 foot level, Gagnon mine. Jefferson County, Montana. Circa 1900. Plate 6-A in U.S. Geological Survey. Professional paper 74. 1912.
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