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Geologic Unit: Bullion Mountains
Map showing publication footprint
  • Usage in publication:
    • Bullion Mountains Intrusive Suite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Granite
    • Quartz monzonite
  • AAPG geologic province:
    • Mojave basin
Publication:

Howard, K.A., 2002, Geologic map of the Sheep Hole Mountains 30' x 60' quadrangle, San Bernardino and Riverside Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map, MF-2344, 2 sheets, scale 1:100,000


Summary:

Unit is named the Bullion Mountains Intrusive Suite. Consists of the Virginia Dale Quartz Monzonite (new) and numerous unnamed units. Is widely exposed in the Bullion, Pinto, and Sheep Hole Mountains, and small parts of the Calumet and Coxcomb Mountains. Consists of rocks ranging in composition from quartz monzodiorite to granite, most of which contain lavender alkali feldspar. Age is Jurassic based on isotopic dating of the Virginia Dale Quartz Monzonite.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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