Bleached porphyry of Hahns Peak. Routt County, Colorado. 1972.
Dates
Date Taken
1972
Summary
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.
Summary
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.
Available in the U.S. Geological Survey Denver Library Photographic Collection, Young, E. J. Collection.
Rights
This USGS product is considered to be in the U.S. public domain. For further information on the USGS Information Policies and Instructions, refer to the Copyrights and Credits section on this web page: http://www.usgs.gov/laws/info_policies.html