MAPPING OF THE NORTHERN THIRD OF THE SIX MILE QUADRANGLE, PICKENS COUNTY, SOUTH CAROLINA

Particular focus has been on defining the Seneca Fault between the underlying Walhalla nappe and the overlying Six Mile Thrust Sheet, as the Seneca Fault was not recognized in the regional geology until 1974. Table Rock gneiss and Walhalla amphibolite of the kyanite-grade, Walhalla nappe and Tallulah Falls gneiss and schist formations of the sillimanite-grade, Six Mile Thrust Sheet were mapped along the northern margin of the Six Mile Quadrangle bordering the southern boundary of the Sunset Quadrangle.

The northern portion of the Six Mile Quadrangle is dominated by hornblende gneisses and amphibolites with interspersed Table Rock gneiss. Table Rock gneiss is a fine-grained, primarily leucocratic gneiss with minor biotite and hornblende. The Walhalla amphibolite comprises hornblende, quartz, and alkali feldspar. Hanging wall formations including the Tallulah Falls gneiss and Tallulah Falls schist of the Tallulah Falls Formation are evident in the central portion of the study area due to synclinal folding, with klippen surrounded by footwall formations in the east. The Tallulah Falls gneiss is composed of biotite and muscovite with porphyroblastic feldspar and quartz. The Tallulah Falls schist ranges from ±garnet-±sillimanite-±biotite-muscovite-schist. Amphibolite and pegmatite occur in both the hanging wall and footwall in the northern portion of the Six Mile Quadrangle.