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Geologic Unit: Woodland
Map showing publication footprint
  • Usage in publication:
    • Woodland gneiss*
  • Modifications:
    • Named
  • Dominant lithology:
    • Gneiss
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Hewett, D.F., and Crickmay, G.W., 1937, The warm springs of Georgia, their geologic relations and origin; a summary report: U.S. Geological Survey Water-Supply Paper, 819, 40 p.


Summary:

Woodland gneiss named for town in Talbot Co., western GA. Predominantly a coarse-grained biotite augen gneiss. Persistently underlies basal bed of Hollis quartzite. 100 ft or more of gneiss immediately underneath quartzite is thinly laminated, locally schistose. Progressively lower or deeper in the mass, the lamination is more widely spaced, and rock assumes common gneissic texture. Because gneiss is the most completely metamorphosed of the igneous rocks of the region, it is assumed to be the oldest. Intruded by Cunningham granite (new). Age is Precambrian.

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


Map showing publication footprint
  • Usage in publication:
    • Woodland Gneiss
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Sears, J.W., and Cook, R.B., Jr., 1984, An overview of the Grenville basement complex of the Pine Mountain window, Alabama and Georgia, IN Bartholomew, M.J., ed., The Grenville event in the Appalachians and related topics: Geological Society of America Special Paper, 194, p. 281-287.


Summary:

Name Woodland Gneiss is here extended into AL to encompass rocks formerly mapped as Wacoochee Complex as units are structurally continuous and lithologically similar. In Lee Co., AL, gneisses similar to those at type locality are here assigned to Woodland.

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


Map showing publication footprint
  • Usage in publication:
    • Woodland Gneiss
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Odom, A.L., Kish, S.A., and Russell, C.W., 1985, U-Pb and Rb-Sr geochronology of the basement rocks in the Pine Mountain belt of southwest Georgia, IN Kish, S.A., Hanley, T.B., and Schamel, Steven, Geology of the southwestern Piedmont of Georgia; [No. 5]: Geological Society of America Field Trip Guidebook, 98th annual meeting, Orlando, FL, October 28-31, 1985, p. 12-47.


Summary:

Rb-Sr date of 1055+/-20 Ma obtained on zircon from Woodland Gneiss.

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


Map showing publication footprint
  • Usage in publication:
    • Woodland Gneiss*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Higgins, M.W., Atkins, R.L., Crawford, T.J., Crawford, R.F., III, Brooks, Rebekah, and Cook, R.B., Jr., 1988, The structure, stratigraphy, tectonostratigraphy, and evolution of the southernmost part of the Appalachian Orogen, Georgia and Alabama: U.S. Geological Survey Professional Paper, 1475, 173 p., (incl. geologic map, scale 1:500,000)


Summary:

The Woodland Gneiss is assigned to the Grenville basement Wacoochee Complex, in the Pine Mountain anticlinorium, in the Bill Arp thrust sheet in central and west-central GA. Age is Middle Proterozoic.

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


Map showing publication footprint
  • Usage in publication:
    • Woodland Gneiss*
  • Modifications:
    • Geochronologic dating
  • 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:

Woodland Gneiss has Rb-Sr whole-rock isochron age of 1055 +/-20 Ma and U-Pb upper intercept age of 1087 Ma (Odom and others, 1985).

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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