U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Alum
Search archives
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
Publication:

Rankin, D.W. (editor), Chiarenzelli, J.R., Drake, A.A., Jr., Goldsmith, Richard, Hall, L.M., Hinze, W.J., Isachsen, Y.W., Lidiak, E.G., McLelland, James, Mosher, Sharon, Ratcliffe, N.M., Secor, D.T., Jr., and Whitney, P.R., 1993, Proterozoic rocks east and southeast of the Grenville Front, IN Reed, J.C., Jr., and others, eds., Precambrian; conterminous U.S.: Geological Society of America, The Geology of North America, The Decade of North American Geology (DNAG), v. C-2, p. 335-461.


Summary:

Alum Phyllite and Willis Phyllite of Dietrich (1959) are not used in this report. Those rocks are now assigned to the Wills Ridge Formation (new). Report includes geologic maps, correlation chart, and isotopic data.

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:11:06 PM MDT