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National Geologic Map Database
Geologic Unit: Sparks
Map showing publication footprint
  • Usage in publication:
    • Sparks schist*
  • Modifications:
    • Named
  • Dominant lithology:
    • Schist
    • Gneiss
    • Quartzite
  • 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:

Named Sparks schist for Sparks Creek which flows southward near western boarder of Warm Springs quadrangle, GA. The unit is confined to a belt 3-5 miles wide that extends across the quadrangle between Pine and Oak Mountains. The Sparks consists of several varieties of mica schist, biotite gneiss, and quartzite which are so interlayered as not to be separable in areal mapping. It underlies the Hollis quartzite and is considered the oldest rocks in the area south of the Towaliga fault.

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


Map showing publication footprint
  • Usage in publication:
    • Sparks Schist*
  • Modifications:
    • Revised
    • Age modified
    • Areal extent
  • 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 Sparks Schist is assigned to the Grenville basement Wacoochee Complex in the Pine Mountain anticlinorium in the Bill Arp thrust sheet in GA and AL. It structurally underlies the Hollis Quartzite of the Pine Mountain Group. The Sparks was assigned to the Pine Mountain Group by Crickmay (1952), but this study shows that it belongs with the Grenville basement. Two different schists have been mapped as Sparks Schist in the past, one derived from shearing of granulitic basement gneisses, and the other a pelitic schist intruded by the gneisses. The Sparks Schist is here restricted to the pelitic schists. Age is Middle Proterozoic.

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 ([ ]).