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

Herz, Norman, and Force, E.R., 1984, Rock suites in Grenvillian terrane of the Roseland district, Virginia; Part 1, Lithologic relations, IN Bartholomew, M.J., ed., The Grenville event in the Appalachians and related topics: Geological Society of America Special Paper, 194, p. 187-200.


Summary:

The Shaeffer Hollow Granite is here named in the Roseland district of Nelson and Amherst Cos., VA. It consists of coarse-grained, leucocratic, blue quartz granite with tabular feldspar phenocrysts and porphyritic texture. Is cut by dikes of, and forms xenoliths in, the Roses Mill pluton. Age is Middle Proterozoic based on U-Pb ages of 1787 and 980 Ma.

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


Map showing publication footprint
  • Usage in publication:
    • Schaeffer Hollow granite
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Rader, E.K., and Evans, N.H., 1993, Geologic map of Virginia; expanded explanation: Virginia Division of Mineral Resources, 80 p.


Summary:

Unit is used informally on VA State map [and misspelled]. Described as leucocratic, coarse-grained, porphyritic, alkali feldspar-blue quartz granite. May contain as much as 10 percent biotite (after hornblende or pyroxene?). Accessories include ilmenite, apatite, and zircon. Gradational into mylonitic flaser gneiss. Contains granulite xenoliths. Age is Middle Proterozoic.

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


Map showing publication footprint
  • Usage in publication:
    • Shaeffer Hollow Granite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Piedmont-Blue Ridge province

Search archives

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 ([ ]).