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  3. Photomicrograph of intrusion breccia, west of Boulder. Boulder County, Colorado. circa 1932.

Photomicrograph of intrusion breccia, west of Boulder. Boulder County, Colorado. circa 1932.

Dates

Date Taken
1932

Summary

Album caption and index card: Photomicrograph of intrusion breccia of group 11 from Logan mine, 5 miles west of Boulder. Highly fragmented granite and some porphyry and early vein material lie in a biotite-flecked glassy groundmass that is partly silicified and sericitized. b, Fragment of biotite latite; g, glassy groundmass. Crossed nicols. Boulder County, Colorado. Notes: Published as figure XVII-A in U.S.Geological Survey. Professional Paper 223. 1950.

Contacts

Data Owner :
U.S. Geological Survey
Photographer :
Lovering, Thomas Seward

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lts00709.jpg thumbnail 5.59 MB image/jpeg

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Available in the U.S. Geological Survey Denver Library Photographic Collection, Lovering, T.S.
 

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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
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Identifiers

Type Scheme Key
name photoLibrary lts00709
number photoLibrary 22500
batch photoLibrary btch297
number_in_book photoLibrary 709

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