Peedee Formation - Black Creek Group, undivided
Coastal terrace of Carolinas. Pliocene equivalent to Yorktown. Deeply weathered.
Unconformable on all underlying units, fluvial sand and gravel at base, grading upwards into fine sands and silts, local peat. May be overrun with recent sediments from forest cutting and agriculture.
Poorly sorted clayey sand and gravel deposited in delta-dominated fluvial- and restricted marine environments. Unit is characterized by an abundance of smoky quartz gravel, feldspar, monazite, and garnet typically concentrated in placer deposits. Generally non-marine from North Carolina to central Georgia but contains shallow-water delta-front deposits in western Georgia.
Poorly to well sorted sand, clay and carbonates deposited in delta-dominated fluvial- and open-marine environments. Unit is characterized by commercial kaolin bodies in older strata from westernmost South Carolina to central Georgia. Younger strata are cyclic marine deposits which deeper water facies exposed in western Georgia. Carbonate facies are locally mined in western Georgia for agricultural lime.
Laminated metamudstone; contains Middle Cambrian or younger sponge spicules
Metamorphosed siltstones and sandstones having interbedded felsic to mafic metavolcanic rocks
Granite - Columbia pluton
Granite - Harbison pluton
Little Mountain metatonalite
Amphibolite and amphibolite gneiss