Geologic units in Edgefield county, South Carolina

Additional scientific data in this geographic area

Huber/Lisbon/Barnwell Formations, undivided (Eocene) at surface, covers 24 % of this area

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.

Migmatite paragneiss and schist of Kiokee belt (Cambrian or Neoproterozoic) at surface, covers 20 % of this area

Migmatitic hornblende-biotite paragneiss having interlayered sillimanite schist and amphibolite

Richtex Formation (Ordovician to Middle Cambrian) at surface, covers 20 % of this area

Laminated metamudstone; contains Middle Cambrian or younger sponge spicules

Persimmon Fork Formation (Cambrian to Neoproterozoic) at surface, covers 20 % of this area

Predominately metatuff

Mylonitic rocks of Modoc Fault Zone (Late Paleozoic) at surface, covers 8 % of this area

Mylonite gneiss

Black Creek/Cusseta/Blufftown Formations (Cretaceous) at surface, covers 2 % of this area

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.

Asbill Pond Formation (Middle Cambrian) at surface, covers 2 % of this area

Metamorphosed siltstones and sandstones having interbedded felsic to mafic metavolcanic rocks

Granite (Carboniferous to Permian) at surface, covers 2 % of this area

Granite

Granite - Cuffytown Creek pluton (Carboniferous to Permian) at surface, covers 1 % of this area

Granite - Cuffytown Creek pluton

Metavolcanic and metasedimentary rocks of Bel Air Belt (Ordovician to Neoproterozoic) at surface, covers 1 % of this area

Metavolcanic and metasedimentary rocks of Bel Air Belt

Granite - Edgefield pluton (Carboniferous to Permian) at surface, covers 1.0 % of this area

Granite - Edgefield pluton

Unnamed granite of Eastern Piedmont (Carboniferous to Permian) at surface, covers 0.7 % of this area

Unnamed granite of Eastern Piedmont

Granite - Johnson pluton (gneissic sheets) (Carboniferous to Permian) at surface, covers 0.7 % of this area

Granite - Johnson pluton (gneissic sheets)