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Filters: Tags: Routt County, Colorado. (X) > Date Range: {"choice":"year"} (X)

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Panorama with image 239. General view of lower coal-bearing series at mouth of Fish Creek, looking north. Routt County, Colorado. 1905.
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J. Paul Storrs, mining engineer, U.S. Geological Survey, examining stripping operations and dragline on Edna Coal Company's lease
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Album caption: Bleached porphyry of Hahns Peak. Dark quartz andesite porphyry dike rock. Routt County, Colorado. 1972. (Specimen) Published as figure 6 in U. S. Geological Survey. Bulletin 1367. 1973.


    map background search result map search result map Bleached porphyry of Hahns Peak. Routt County, Colorado. 1972. Bleached porphyry of Hahns Peak. Routt County, Colorado. 1972.