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Geologic units in Edgefield county, South Carolina

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
Lithology: metavolcanic rock; metasedimentary rock
Black Creek/Cusseta/Blufftown Formations (Cretaceous) at surface, covers 2 % of this area
Black Creek/Cusseta/Blufftown Formations: 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.
Lithology: sand; clay or mud
Granite (Carboniferous to Permian) at surface, covers 2 % of this area
Granite
Lithology: granite
Persimmon Fork Formation (Cambrian to Neoproterozoic) at surface, covers 20 % of this area
Persimmon Fork Formation: predominately metatuff
Lithology: metavolcanic rock
Granite- Edgefield pluton (Carboniferous to Permian) at surface, covers 1.0 % of this area
Granite- Edgefield pluton
Lithology: granite
Asbill Pond Formation (Middle Cambrian) at surface, covers 2 % of this area
Asbill Pond Formation: metamorphosed siltstones and sandstones having interbedded felsic to mafic metavolcanic rocks
Lithology: metasedimentary rock; metavolcanic rock
Mylonitic rocks of Modoc Fault Zone (Late Paleozoic) at surface, covers 8 % of this area
Mylonitic rocks of Modoc Fault Zone: mylonite gneiss
Lithology: mylonite
Richtex Formation (Ordovician to Middle Cambrian) at surface, covers 20 % of this area
Richtex Formation: laminated metamudstone; contains Middle Cambrian or younger sponge spicules
Lithology: metasedimentary rock
Granite- Cuffytown Creek pluton (Carboniferous to Permian) at surface, covers 1 % of this area
Granite- Cuffytown Creek pluton
Lithology: granite
Huber/Lisbon/Barnwell Formations, undivided (Eocene) at surface, covers 23 % of this area
Huber/Lisbon/Barnwell Formations, undivided: 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.
Lithology: sand; clay or mud; carbonate; kaolin
Granite- Johnson pluton (gneissic sheets) (Carboniferous to Permian) at surface, covers 0.7 % of this area
Granite- Johnson pluton (gneissic sheets)
Lithology: granite
Migmatite paragneiss and schist of Kiokee belt (Cambrian or Neoproterozoic) at surface, covers 20 % of this area
Migmatite paragneiss and schist of Kiokee belt: migmatitic hornblende-biotite paragneiss having interlayered sillimanite schist and amphibolite
Lithology: paragneiss; schist; amphibolite
Unnamed granite of Eastern Piedmont (Carboniferous to Permian) at surface, covers 0.7 % of this area
Unnamed granite of Eastern Piedmont
Lithology: granite

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Page Last modified: 11:25 on 07-Jan-2014