- Usage in publication:
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- Comers granite gneiss*
- Modifications:
-
- Named
- Dominant lithology:
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- Gneiss
- AAPG geologic province:
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- Piedmont-Blue Ridge province
Summary:
Named for village of Comers Rock, southwestern VA. Well exposed on Elk Creek and its tributaries, south and southeast of Elk Creek village, and on Turkey Fork, east of Tims Knob. Consists of equigranular to porphyritic rock which consists of pink microcline and quartz in greenish-gray matrix composed of chlorite and epidote. Quartz usually blue in color. Injected with pink pegmatite related to Carsonville granite. May be a composite rock formed by partial replacement of older rocks by Carsonville granite. Contains less mafic minerals than Carsonville granite; otherwise, the two rocks are similar in mineral content. Age is Precambrian.
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 ([ ]).