Contact of pegmatite and gneiss in northeast face of open cut at Firestone Mica mine. Custer County, South Dakota. 1923.
Dates
Date Taken
1923
Summary
Contact of pegmatite and gneiss in northeast face of open cut at Firestone Mica mine, near Custer. Custer County, South Dakota. Before 1923. Plate 28-A in U.S. Geological Survey. Bulletin 740. 1923.
Summary
Contact of pegmatite and gneiss in northeast face of open cut at Firestone Mica mine, near Custer. Custer County, South Dakota. Before 1923. Plate 28-A in U.S. Geological Survey. Bulletin 740. 1923.
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