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Mineral Resources > Online Spatial Data > Geology > by state > South Carolina Geology

Geologic units in Chesterfield county, South Carolina

Peedee Formation /Black Creek Group, undivided (Cretaceous) at surface, covers 62 % of this area

Peedee Formation /Black Creek Group, undivided

Lithology: clay or mud; sand; limestone

Cid Formation, Mudstone Member (Ordovician to Late Cambrian) at surface, covers 4 % of this area

Cid Formation, Mudstone Member: thin bedded tuffaceous metasiltstone

Lithology: metasedimentary rock

Cape Fear/Eutaw Formations (Cretaceous) at surface, covers 10 % of this area

Cape Fear/Eutaw Formations Kcfe: 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.

Lithology: sand; gravel

Middendorf Formation (Cretaceous) at surface, covers < 0.1 % of this area

Middendorf Formation - sand, sandstone, and mudstone, gray to pale gray with an orange cast, mottled; clay balls and iron-cemented concretions common, beds laterally discontinuous, cross-bedding common.

Lithology: sand; sandstone; mudstone; clay or mud

Brandywine Formation (Miocene) at surface, covers 1.0 % of this area

Brandywine Formation: Upland gravel similar to Columbia group mapped in the uplands of southern Maryland southeast of DC. 10-40 ft thick. Extensive sand and gravel resources.

Lithology: gravel; sand

Granite (Carboniferous to Permian) at surface, covers < 0.1 % of this area

Granite

Lithology: granite

Persimmon Fork Formation (Cambrian to Neoproterozoic) at surface, covers 8 % of this area

Persimmon Fork Formation: predominately metatuff

Lithology: metavolcanic rock

Chatham Group, undivided (Triassic) at surface, covers 1.0 % of this area

Chatham Group, undivided: conglomerate, sandstone and mudstone

Lithology: conglomerate; sandstone; mudstone

Penholoway Formation (Pleistocene) at surface, covers 0.9 % of this area

Penholoway Formation: Similar to Cape May, broad lateral extent underlying terraces in the Carolinas; swamps and ridges on terrace surface were originally barrier islands and back bays. Superimposed on these landforms are swarms of Carolina bays.

Lithology: sand; clay or mud

Socastee Formation (Pleistocene) at surface, covers 0.5 % of this area

Socastee Formation: Low coastal formation in Carolinas like Penholoway but younger and lower in altitude.

Lithology: sand; clay or mud

Alluvial Valley Swamp (Quaternary) at surface, covers 5 % of this area

Alluvial Valley Swamp: 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.

Lithology: sand; gravel; silt; peat

Duplin Formation (Pliocene) at surface, covers 2 % of this area

Duplin Formation: Coastal terrace of Carolinas. Pliocene equivalent to Yorktown. Deeply weathered.

Lithology: sand; clay or mud; conglomerate

Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Metamudstone and Meta-Argillite - bedding plane and axial-planar cleavage common; interbedded with metasandstone, meta-conglomerate, and metavolcanic rock.

Lithology: metasedimentary rock; meta-argillite; meta-conglomerate; metavolcanic rock

Granite- Pageland pluton (Carboniferous to Permian) at surface, covers 0.9 % of this area

Granite- Pageland pluton

Lithology: granite

Richtex Formation (Ordovician to Middle Cambrian) at surface, covers 4 % of this area

Richtex Formation: laminated metamudstone; contains Middle Cambrian or younger sponge spicules

Lithology: metasedimentary rock

Flat Swamp Formation (AKA Flat Swamp Member of Cid Formation) (Ordovician to Neoproterozoic) at surface, covers 0.9 % of this area

Flat Swamp Formation (AKA Flat Swamp Member of Cid Formation): crystal and lithic metatuff of rhyolite to rhyodacite composition

Lithology: felsic metavolcanic rock