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National Geologic Map Database
Geologic Unit: Alum
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Map showing publication footprint
  • Usage in publication:
    • Alum phyllite
  • Modifications:
    • Named
  • Dominant lithology:
    • Phyllite
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Dietrich, R.V., 1959, Geology and mineral resources of Floyd County of the Blue Ridge Upland, southwestern Virginia: Virginia Polytechnic Institute and State University, Bulletin of the Engineering Experimental Station Series, no. 134, 160 p.


Summary:

Alum phyllite, a new name in the Alum Ridge district, Floyd Co., VA, consists chiefly of sericitic slate-phyllite. Main mass appears to lie conformably within Lynchburg gneiss (Lynchburg as used here may not be correlative of type Lynchburg). The Alum grades both upward and downward, through a few feet, into Lynchburg gneiss, except locally along its northern contact where it appears to grade into Little River gneiss (new). Age given as Precambrian.

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


Map showing publication footprint
  • Usage in publication:
    • Alum Phyllite
  • Modifications:
    • Not used
  • AAPG geologic province:
    • Piedmont-Blue Ridge province

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 ([ ]).