Sacramento porphyry; note more coarsely crystalline texture and darker color: length of specimen 4 inches. Lake County, Colorado. 1935.
Dates
Date Taken
1935
Summary
Sacramento porphyry; note more coarsely crystalline texture and darker color: length of specimen 4 inches. Lake County, Colorado. 1935. Figure 36, in U.S.Geological Survey Professional paper 235. 1953.
Summary
Sacramento porphyry; note more coarsely crystalline texture and darker color: length of specimen 4 inches. Lake County, Colorado. 1935. Figure 36, in U.S.Geological Survey Professional paper 235. 1953.
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