U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Chispa
Search archives
Map showing publication footprint
  • Usage in publication:
    • Chispa andesite*
  • Modifications:
    • Original reference
  • AAPG geologic province:
    • Great Basin province
Publication:

Ransome, F.L., 1909, The geology and ore deposits of Goldfield, Nevada: U.S. Geological Survey Professional Paper, 66, 258 p., (incl. geologic map, scale 1:24,000)


Summary:

Pg. 28, 64, etc. Chispa andesite. One to five flows of brownish gray porous andesite interbedded in the dacite vitrophyre on Chispa Hills. Younger than Milltown andesite and older than Meda rhyolite. Age is Tertiary.
Recognized in Chispa Hills, Goldfield district, [in T. 3 S., R. 43 E., Goldfield 15-min quadrangle, Esmeralda-Nye Co. line, southwestern NV].

Source: US geologic names lexicon (USGS Bull. 896, p. 436).


Map showing publication footprint
  • Usage in publication:
    • Chispa Andesite*
  • Modifications:
    • Age modified
    • Geochronologic dating
  • AAPG geologic province:
    • Great Basin province
Publication:

Ashley, R.P., 1975, Preliminary geologic map of the Goldfield mining district, Nevada: U.S. Geological Survey Miscellaneous Field Studies Map, MF-681, 1 sheet, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_3816.htm]


Summary:

Age of the Chispa Andesite is revised from Tertiary to early Miocene based on a radiometric [K-Ar] age of 20.4 +/-0.4 Ma (Ashley and Silberman, 1976).

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 04 Apr 2024 03:38:57 PM MDT