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  3. Photomicrograph of porphyritic hornblende diorite taken from Swan River. Boulder County, Colorado. circa 1932.

Photomicrograph of porphyritic hornblende diorite taken from Swan River. Boulder County, Colorado. circa 1932.

Dates

Date Taken
1932

Summary

Album caption and index card: Photomicrograph of porphyritic hornblende diorite of group 4 from Swan River 2 miles south of Tiger [extinct mining town], showing reaction series. Core of augite (a) bordered by hornblende (h) which in turn is completely rimmed by biotite (b). Cross nicols. Boulder County, Colorado. Notes: Published as figure X-F in U.S.Geological Survey. Professional Paper 223. 1950.

Contacts

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

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lts00699.jpg thumbnail 2.5 MB image/jpeg

Material Request Instructions

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 lts00699
number photoLibrary 22490
batch photoLibrary btch297
number_in_book photoLibrary 699

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