Laminated metamudstone; contains Middle Cambrian or younger sponge spicules
Metamorphosed siltstones and sandstones having interbedded felsic to mafic metavolcanic rocks
Moderately to poorly sorted sand and clay deposited in delta-dominated shallow marine environments. Unit is characterized by sands containing locally abundant (F-VC grained) tourmaline and (F-VC grained) muscovite with some monazite and garnet. Clay layers are also common and some lower delta plain deposits form commercial kaolin bodies. Generally very restricted marine in eastern Georgia becoming more open marine to the east and west.
Mafic to intermediate metavolcanics including layered hornblende gneiss and amphibolite
Granite - Batesburg (gneissic) pluton
Granite - Clouds Creek pluton
Little Mountain metatonalite
Diorite-gabbro - Clouds Creek pluton
Phyllonite and phyllonitic schist
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.
Metamorphosed granitoid rocks, undivided