The National Geologic Map Database is migrating to a new infrastructure. We apologize for any service disruptions during this process.

U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • 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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 21 May 2026 06:06:42 PM MDT