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  3. Iowa Gulch porphyry, finely crystalline facies; dark spots are chiefly dendrites of manganese dioxide: length of specimen 3 inches. Lake County, Colorado. 1935.

Iowa Gulch porphyry, finely crystalline facies; dark spots are chiefly dendrites of manganese dioxide: length of specimen 3 inches. Lake County, Colorado. 1935.

Dates

Date Taken
1935

Summary

Iowa Gulch porphyry, finely crystalline facies; dark spots are chiefly dendrites of manganese dioxide: length of specimen 3 inches. Lake County, Colorado. 1935. Figure 37, in U.S.Geological Survey Professional Paper 235. 1953.

Contacts

Data Owner :
U.S. Geological Survey
Photographer :
Behre, Charles Henry

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bch00038.jpg thumbnail 5.37 MB image/jpeg

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Identifiers

Type Scheme Key
name photoLibrary bch00038
number photoLibrary 3881
batch photoLibrary btch301
number_in_book photoLibrary 38

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