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).

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).