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Geologic Unit: Fees
Map showing publication footprint
  • Usage in publication:
    • Fees Rhyolite Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Rhyolite
  • AAPG geologic province:
    • Appalachian basin
Publication:

Rankin, D.W., 1993, The volcanogenic Mount Rogers Formation and the overlying glaciogenic Konnarock Formation; two Late Proterozoic units in southwestern Virginia: U.S. Geological Survey Bulletin, 2029, 26 p.


Summary:

Named as a member near base of Mount Rogers Formation. Named for Fees Ridge, northeast part of Park quad, southwestern VA. Consists of highly sheared porphyritic rhyolite, characterized by a phenocryst assemblage of quartz, perthite, and plagioclase. Groundmass is aphanitic and has grayish-purple or maroon tinge. Thickness is about 100 m. Mapping of float indicates that Fees is in contact with Middle Proterozoic Cranberry Gneiss; elsewhere, Fees is in contact with lower part of Mount Rogers. Age is Late Proterozoic. Report contains geologic map.

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 ([ ]).

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