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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Rock Mills Granite
  • Modifications:
    • Named
  • Dominant lithology:
    • Granite
    • Gneiss
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Bentley, R.D. (editor), and Neathery, T.L. (editor), 1970, Geology of the Brevard fault zone and related rocks of the Inner Piedmont of Alabama: Alabama Geological Society Annual Field Trip Guidebook, December 4-5, 1970, no. 8, 119 p.


Summary:

Name Rock Mills granite introduced in this report for granitic gneiss of the Dadeville Complex exposed at Rock Mills, Randolph Co., AL. Consists of two varieties: a coarse-grained, slightly foliated leucocratic-granite gneiss and a well-foliated biotite-granite gneiss. The two varieties occur mixed together and their relationship is unclear. Predominant minerals are biotite, microcline, oligoclase, and quartz. Age is early Paleozoic

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


Map showing publication footprint
  • Usage in publication:
    • Rock Mills Granite Gneiss
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Raymond, D.E., Osborne, W.E., Copeland, C.W., and Neathery, T.L., 1988, Alabama stratigraphy: Geological Survey of Alabama Circular, no. 140, 97 p.


Summary:

Rock Mills Granite Gneiss of Dadeville Complex described here as slightly foliated medium- to coarse-grained leucocratic granite gneiss and a well-foliated biotite granite gneiss, composed of biotite, microcline, oligoclase, and quartz with rutile and zircon as accessory minerals. Locally epidote-rich. May include thin, small amphibolite bodies.

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


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).