- Usage in publication:
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- Forbush gneiss
- Modifications:
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- Overview
- Dominant lithology:
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- Gneiss
- AAPG geologic province:
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- Piedmont-Blue Ridge province
Summary:
Forbush orthogneiss of Heyn (1984) here referred to as Forbush gneiss, Middle Proterozoic basement described as intensely sheared biotite augen gneiss. Occurs outermost part of the Sauratown Mountains anticlinorium. Forbush here also includes rocks referred to by Heyn (1984) as "bag." Underlies Ashe Formation. U-Pb concordia upper-intercept age on zircon is 1230+/-6 Ma according to McConnell and others (1988).
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 ([ ]).