U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • State Farm gneiss
  • Modifications:
    • Named
  • Dominant lithology:
    • Gneiss
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Brown, C.B., 1937, Outline of the geology and mineral resources of Goochland County, Virginia: Virginia Geological Survey Bulletin, no. 48, 68 p.


Summary:

Named for typical outcrops near State Farm, Goochland Co., central VA. Consists of light- to dark-gray, medium-grained, relatively uniform, evenly banded gneiss with well-developed foliation. Age is Precambrian.

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


Map showing publication footprint
  • Usage in publication:
    • State Farm Gneiss*
  • Modifications:
    • Overview
    • Geochronologic dating
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Rankin, D.W., 1994, Continental margin of the eastern United States; past and present, IN Speed, R.C., ed., Phanerozoic evolution of North American continent-ocean transitions: Geological Society of America, The Decade of North American Geology (DNAG), Continent-Ocean Transect Series, p. 129-218.


Summary:

Grenvillian [Middle Proterozoic] rocks cropping out in eastern Piedmont of VA in region called Goochland terrane by Horton and others (1989) or Goochland granulite terrane by Farrar (1984). Lithic sequence (ascending) consists of State Farm Gneiss (felsic to intermediate gneisses of both igneous and sedimentary protoliths), Sabot Amphibolite (mafic volcanic protolith), and Maidens Gneiss (heterogeneous unit that is probably metavolcanic and metasedimentary in origin). State Farm Gneiss has Rb-Sr whole-rock age of 1031+/-94 Ma (Glover, 1989).

Source: GNU records (USGS DDS-6; Reston 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 03:33:10 PM MDT