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  • Usage in publication:
    • Richmond Mountain Andesite*
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Andesite
  • AAPG geologic province:
    • Great Basin province
Publication:

Nolan, T.B., Merriam, C.W., and Blake, M.C., Jr., 1974, Geologic map of the Pinto Summit quadrangle, Eureka and White Pine Counties, Nevada: U.S. Geological Survey Miscellaneous Investigations Series Map, I-793, 1 sheet, 14 p., scale 1:31,680


Summary:

Unit is named the Richmond Mountain Andesite. Consists of andesite flows and associated dikes. Weathers dark reddish-brown. Thickness is 213 m at type. Unconformably overlies the Pinto Peak Rhyolite. Age is Oligocene based on five radiometric (K-Ar) dates ranging from 35.6 to 33.2 Ma. (B1520)

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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