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Album caption: Foliated border zone of hornblende-biotite quartz diorite of the Bucks Lake pluton, 1 mile south-southwest of Spanish Peak. Dark minerals are hornblend and biotite; light-colored minerals are plagioclase and quartz. Plumas County, California. ca. 1967. (Specimen) Published as figure 28 in U.S. Geological Survey. Professional paper 731. 1973.


    map background search result map search result map Foliated border zone of hornblende-biotite quartz diorite of the Bucks Lake pluton, 1 mile south-southwest of Spanish Peak.   Plumas County, California.  circa 1967. Foliated border zone of hornblende-biotite quartz diorite of the Bucks Lake pluton, 1 mile south-southwest of Spanish Peak.   Plumas County, California.  circa 1967.