From Miller tunnel of Incas Mine, black fragments are Pony express limestone of Wanakah formation. La Plata County, Colorado. 1936.
Dates
Date Taken
1936
Summary
Textures of intrusive breccias, composed of various rock fragments in a matrix of fine- grained rock: From Miller tunnel of Incas Mine, black fragments are Pony express limestone of Wanakah formation; light fragments are porphyry. Colorado. Circa 1936. Plate 5-A, in U.S.Geological Survey Professional paper 219. 1949.
Summary
Textures of intrusive breccias, composed of various rock fragments in a matrix of fine- grained rock: From Miller tunnel of Incas Mine, black fragments are Pony express limestone of Wanakah formation; light fragments are porphyry. Colorado. Circa 1936. Plate 5-A, in U.S.Geological Survey Professional paper 219. 1949.
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