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Geologic units in North Carolina (state in United States)

Additional scientific data in this geographic area

Yorktown Formation and Duplin Formation, Undivided (Tertiary) at surface, covers 12 % of this area

Yorktown Formation and Duplin Formation, Undivided - Yorktown Formation: fossiliferous clay with varying amounts of fine-grained sand, bluish gray, shell material commonly concentrated in lenses; mainly in area north of Neuse River. Duplin Formation: shelly, medium- to coarse-grained sand, sandy marl, and limestone, bluish gray; mainly in area south of Neuse River.

Lithology: clay or mud; sand; limestone

Black Creek Formation (Cretaceous) at surface, covers 9 % of this area

Black Creek Formation - clay, gray to black, lignitic; contains thin beds and laminae of fine-grained micaceous sand and thick lenses of cross-bedded sand. Glauconitic, fossiliferous clayey sand lenses in upper part.

Lithology: clay or mud; sand

Surficial Deposits, Undivided (Quaternary) at surface, covers 6 % of this area

Surficial Deposits, Undivided - sand, clay, gravel, and peat deposited in marine, fluvial, eolian, and lacustrine environments. Quaternary deposits not shown at altitudes greater than approx. 205 feet above mean sea level (Suffolk Scarp, in part).

Peedee Formation (Cretaceous) at surface, covers 6 % of this area

Peedee Formation - sand, clayey sand, and clay, greenish gray to olive black, massive, glauconitic, locally fossiliferous and calcareous. Patches of sandy molluscan-mold limestone in upper part.

Lithology: sand; clay or mud; limestone

Biotite Gneiss and Schist (Cambrian/Late Proterozoic) at surface, covers 4 % of this area

Biotite Gneiss and Schist - inequigranular, locally abundant potassic feldspar and garnet; interlayered and gradational with calc-silicate rock, sillimanite-mica schist, mica schist, and amphibolite. Contains small masses of granitic rock.

Castle Hayne Formation; Comfort Member and New Hanover Member, undivided (Tertiary) at surface, covers 3 % of this area

Comfort Member and New Hanover Member, undivided - Comfort Member: bryozoan-echinoid skeletal limestone, locally dolomitized, solution cavities common. New Hanover Member: phosphate-pebble conglomerate, micritic, thin; restricted to basal part of Castle Hayne Formation in southeastern counties.

Foliated to Massive Granitic Rock (Permian/Pennsylvanian) at surface, covers 3 % of this area

Foliated to Massive Granitic Rock (270-320my) - megacrystic to equigranular. Butterwood Creek intrusive and Rocky Mount intrusive suite.

Lithology: granite

Middendorf Formation (Cretaceous) at surface, covers 2 % 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.

Metamorphosed Granitic Rock (Cambrian/Late Proterozoic) at surface, covers 2 % of this area

Metamorphosed Granitic Rock (520-650 my) - megacrystic, well foliated, locally contains hornblende; Fountain intrusive.

Lithology: metamorphic rock

Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 2 % of this area

Felsic Metavolcanic Rock - metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; interbedded with mafic and intermediate metavolcanic rock, meta-argillite, and metamudstone.

Mica Schist (Cambrian/Late Proterozoic) at surface, covers 2 % of this area

Mica Schist - Garnet, staurolite, kyanite, or sillimanite occur locally; lenses and layers of quartz schist, micaceous quartzite, calc-silicate rock, biotite gneiss, amphibolite, and phyllite.

Granitic Rock (Permian/Pennsylvanian) at surface, covers 2 % of this area

Granitic Rock (265-325 my) - megacrystic to equigranular. Castalia, Lillington, Medoc Mountain, Sims, Contentnea Creek (?), and Elm City (?) intrusives.

Lithology: granite

Newark Supergroup, Chatham Group; Chatham Group, Undivided (Triassic) at surface, covers 2 % of this area

Chatham Group, Undivided - conglomerate, fanglomerate, sandstone, and mudstone. Conglomerate and fanglomerate shown by pattern.

Biotite Granitic Gneiss (Middle Proterozoic) at surface, covers 2 % of this area

Biotite Granitic Gneiss - unconformity; pinkish gray to light gray, massive to well-foliated, granitic to quartz monzonitic; includes variably mylonitized orthogneiss and paragneiss, interlayered amphibolite, calc-silicate rock, and marble. Includes granites of the Bryson City area, Straight Fork window, and Elk Park Plutonic Suite.

Cape Fear Formation (Cretaceous) at surface, covers 2 % of this area

Cape Fear Formation - sandstone and sandy mudstone, yellowish gray to bluish gray, mottled red to yellowish orange, indurated, graded and laterally continuos bedding, blocky clay, faint cross-bedding, feldspar and mica common.

Ashe Metamorphic Suite and Tallulah Falls Formation; Muscovite-biotite gneiss (Late Proterozoic) at surface, covers 2 % of this area

Muscovite-biotite gneiss - locally sulfidic; interlayered and gradational with mica schist, minor amphibolite, and hornblende gneiss.

River Bend Formation (Tertiary) at surface, covers 2 % of this area

River Bend Formation - limestone, calcarenite overlain by and intercalated with indurated, sandy, molluscan-mold limestone.

Lithology: limestone; calcarenite; sand

Waccamaw Formation (Tertiary) at surface, covers 2 % of this area

Waccamaw Formation - fossiliferous sand with silt and clay, bluish-gray to tan, loosely consolidated. Straddles Pleistocene-Pliocene boundary.

Lithology: sand; silt; clay or mud

Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

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

Amphibolite and Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

Amphibolite and Biotite Gneiss - interlayered; minor layers and lenses of hornblende gneiss, metagabbro, mica schist, and granitic rock.

Cid Formation; Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

(Southwest of Asheboro); Metamudstone and Meta-Argillite - thin to thick bedded; bedding plane and axial-planar cleavage common; interbedded with metasandstone, metaconglomerate, and metavolcanic rock.

Uwharrie Formation; Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

(at Asheboro and to south); Felsic Metavolcanic Rock - metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; interbedded with mafic and intermediate metavolcanic rock, meta-argillite, and metamudstone.

Metavolcanic-Epiclastic Rock (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

Metavolcanic-Epiclastic Rock - metamorphosed argillite, mudstone, volcanic sandstone, and conglomerate, and volcanic rock.

Terrace Deposits and Upland Sediment (Tertiary) at surface, covers 1 % of this area

Terrace Deposits and Upland Sediment - gravel, clayey sand, and sand, minor iron-oxide cemented sandstone.

Phyllite and Schist (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

Phyllite and Schist - minor biotite and pyrite; includes phyllonite, sheared fine-grained metasediment and metavolcanic rock.

Metamorphosed Granitic Rock (Ordovician/Cambrian) at surface, covers 1 % of this area

Metamorphosed Granitic Rock (455-540 my) - equigranular to megacrystic, foliated to massive. Includes Toluca Granite.

Lithology: metamorphic rock

Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

Metavolcanic Rock - interbedded felsic to mafic tuffs and flowrock.

Henderson Gneiss (Cambrian) at surface, covers 1.0 % of this area

Henderson Gneiss (524 my) - monzonitic to granodioritic; inequigranular.

Lithology: gneiss

Felsic Mica Gneiss (Cambrian/Late Proterozoic) at surface, covers 1.0 % of this area

Felsic Mica Gneiss - interlayered with biotite and hornblende gneiss and schist.

Migmatitic Granitic Gneiss (Ordovician/Cambrian) at surface, covers 0.9 % of this area

Migmatitic Granitic Gneiss - foliated to massive, granitic to quartz dioritic; biotite gneiss and amphibolite common.

Coweeta Group; Biotite Gneiss (Middle/Late Proterozoic) at surface, covers 0.8 % of this area

Biotite Gneiss - migmatitic; interlayered and gradational with biotite-garnet gneiss and amphibolite; locally abundant quartz and alumino-silicates. Stratigraphic position uncertain.

Metagraywacke and Muscovite-Biotite Schist (Cambrian/Late Proterozoic) at surface, covers 0.8 % of this area

Metagraywacke and Muscovite-Biotite Schist - metagraywacke (biotite gneiss) interlayered and gradational with muscovite-biotite schist; minor marble and granitic rock.

Metamorphosed Gabbro and Diorite (Paleozoic/Late Proterozoic) at surface, covers 0.8 % of this area

Metamorphosed Gabbro and Diorite - foliated to massive.

Lithology: metamorphic rock

Tillery Formation; Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 0.8 % of this area

(Southwest of Asheboro); Metamudstone and Meta-Argillite - thin to thick bedded; bedding plane and axial-planar cleavage common; interbedded with metasandstone, metaconglomerate, and metavolcanic rock.

Metamorphosed Mafic Rock (Paleozoic/Late Proterozoic) at surface, covers 0.8 % of this area

Metamorphosed Mafic Rock - metagabbro, metadiorite, and mafic plutonic-volcanic complexes.

Lithology: metamorphic rock

Alligator Back Formation; Gneiss (Late Proterozoic) at surface, covers 0.7 % of this area

Gneiss - finely laminated to thin layered; locally contains massive gneiss and micaceous granule conglomerate; includes schist, phyllite, and amphibolite.

Ashe Metamorphic Suite and Tallulah Falls Formation; Amphibolite (Late Proterozoic) at surface, covers 0.7 % of this area

Amphibolite - equigranular, massive to well foliated, interlayered, rarely discordant, metamorphosed intrusive to extrusive mafic rock; may include metasedimentary rock.

Metamorphosed Quartz Diorite (Paleozoic/Late Proterozoic) at surface, covers 0.6 % of this area

Metamorphosed Quartz Diorite - foliated to massive.

Lithology: metamorphic rock

Mafic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 0.6 % of this area

Mafic Metavolcanic Rock - metamorphosed basaltic flows and tuffs, dark green to black; interbedded with felsic and intermediate metavolcanic rock and metamudstone.

Alligator Back Formation; Mica schist and phyllite (Late Proterozoic) at surface, covers 0.6 % of this area

Mica schist and phyllite - laminated to thin layered; interlayered with minor biotite-muscovite gneiss and amphibolite.

Quartz Diorite to Granodiorite (Devonian) at surface, covers 0.6 % of this area

Quartz Diorite to Granodiorite (390 my) - contains biotite, muscovite, and xenocrysts. Includes Whiteside Mountain, Stone Mountain, Mount Airy, Spruce Pine, and other smaller plutons.

Belgrade Formation, Undivided (Tertiary) at surface, covers 0.5 % of this area

Belgrade Formation, Undivided - Pollocksville Member: oyster-shell mounds in tan to orange sand matrix, indurated locally. Haywood Landing Member: fossiliferous clayey sand, gray to brown. Members grade into each other laterally.

Lithology: carbonate; sand; clay or mud

Injected Gneiss (Cambrian/Late Proterozoic) at surface, covers 0.5 % of this area

Injected Gneiss - biotite gneiss and schist intruded by numerous sills and dikes of granite, pegmatite, and aplite; minor hornblende gneiss.

Castle Hayne Formation; Spring Garden Member (Tertiary) at surface, covers 0.5 % of this area

Spring Garden Member - molluscan-mold limestone, indurated, very sandy. Grades downward into a calcareous sand and laterally into Comfort Member.

Lithology: limestone; sand

Intermediate Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 0.4 % of this area

Intermediate Metavolcanic Rock - metamorphosed andesitic tuffs and flows, medium to dark grayish green; minor felsic and mafic metavolcanic rock.

Ocoee Supergroup, Great Smokey Group; Metasandstone, Metagraywacke, Metasiltstone, and Mica Schist (Late Proterozoic) at surface, covers 0.4 % of this area

Metasandstone, Metagraywacke, Metasiltstone, and Mica Schist - beds and lenses of calc-silicate rock locally abundant; garnet, staurolite, and cross-biotite porphyroblasts common in fine-grained layers. Includes Hughes Gap and Hothouse formations in southern area; Horse Branch Member of Ammons Formation and Grassy Branch Formation in northern area.

Fine-grained Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 0.4 % of this area

Fine-grained Biotite Gneiss - strongly foliated; minor layers of amphibolite and muscovite schist.

Newark Supergroup, Chatham Group; Pekin Formation (Triassic) at surface, covers 0.4 % of this area

Pekin Formation - conglomerate, sandstone, and mudstone.

Battleground Formation (Late Proterozoic) at surface, covers 0.4 % of this area

Battleground Formation - quartz-sericite schist with metavolcanic rock, quartz-pebble metaconglomerate, kyanite-sillimanite quartzite, and garnet-quartz rock.

Granitic Rock (Devonian/Ordovician) at surface, covers 0.4 % of this area

Granitic Rock - locally pinkish gray, massive to weakly foliated; contains hornblende.

Lithology: granite

Floyd Church Formation; Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 0.4 % of this area

(Southwest of Asheboro); Metamudstone and Meta-Argillite - thin to thick bedded; bedding plane and axial-planar cleavage common; interbedded with metasandstone, metaconglomerate, and metavolcanic rock.

Ocoee Supergroup, Great Smokey Group; Copperhill Formation (Late Proterozoic) at surface, covers 0.4 % of this area

Copperhill Formation - metagraywacke, massive, graded bedding common; includes dark-gray slate, mica schist, and nodular calc-silicate rock.

Pinehurst Formation (Tertiary) at surface, covers 0.4 % of this area

Pinehurst Formation - sand, medium- to coarse-grained, cross-bedding and rhythmic bands of clayey sand common, unconsolidated.

Lithology: sand; clay or mud

Ocoee Supergroup, Great Smokey Group; Wehutty Formation (Late Proterozoic) at surface, covers 0.3 % of this area

Wehutty Formation - slate to schist, dark gray, graphitic and sulfidic; includes mica schist, metagraywacke, and metaconglomerate.

Newark Supergroup, Chatham Group; Sanford Formation (Triassic) at surface, covers 0.3 % of this area

Sanford Formation - conglomerate, fanglomerate, sandstone, and mudstone.

Gabbro of Concord Plutonic Suite (Devonian/Ordovician) at surface, covers 0.3 % of this area

Gabbro of Concord Plutonic Suite (399-479 my) - Barber, Concord, Farmington, Mecklenburg, and Weddington intrusives.

Lithology: gabbro

Newark Supergroup, Dan River Group; Stoneville Formation (Triassic) at surface, covers 0.3 % of this area

Stoneville Formation - conglomerate, sandstone, and mudstone, lenticular and laterally-gradational bedding.

Granite of Salisbury Plutonic Suite (Devonian/Silurian) at surface, covers 0.3 % of this area

Granite of Salisbury Plutonic Suite (385-415 my) - pink, massive to weakly foliated. Gold Hill, Kannapolis, Salisbury, Southmont, and Yadkin intrusives.

Lithology: granite

Ocoee Supergroup; Great Smokey Group, undivided (Late Proterozoic) at surface, covers 0.3 % of this area

Great Smokey Group, undivided - thick metasedimentary sequence of massive to graded beds of metagraywacke and metasiltstone with interbedded graphitic and sulfidic slate and schist.

Yadkin Formation (Cambrian/Late Proterozoic) at surface, covers 0.3 % of this area

Yadkin Formation - metamorphosed graywacke, volcanic sandstone, and siltstone; interbedded with mafic and intermediate metavolcanic flows and tuffs.

Ashe Metamorphic Suite and Tallulah Falls Formation; Metagraywacke (Late Proterozoic) at surface, covers 0.3 % of this area

Metagraywacke - foliated to massive, locally conglomeratic; interlayered and gradational with mica schist, muscovite-biotite gneiss, and rare graphitic schist.

Blacksburg Formation (Cambrian/Late Proterozoic) at surface, covers 0.3 % of this area

Blacksburg Formation - sericite schist, locally with graphite, phyllite with sericite quartzite, banded marble, amphibolite, and minor calc-silicate rock.

Brasstown Formation (Late Proterozoic) at surface, covers 0.2 % of this area

Brasstown Formation - cross-biotite schist; includes micaceous quartzite in lower part.

Lithology: mica schist; quartzite

Cherryville Granite (Mississippian) at surface, covers 0.2 % of this area

Cherryville Granite (351 my) - massive to weakly foliated; contains pegmatites.

Lithology: granite; pegmatite

Migmatitic Biotite-Hornblende Gneisses (Middle Proterozoic) at surface, covers 0.2 % of this area

Migmatitic Biotite-Hornblende Gneisses (1214 my) - unconformity; layered biotite-granite gneiss, biotite-hornblende gneiss, amphibolite, calc-silicate rock; locally contains relict granulite facies rock.

Mineral Bluff Formation (Late Proterozoic) at surface, covers 0.2 % of this area

Mineral Bluff Formation - quartz-chlorite-sericite schist and phyllite with thin quartzite layers and minor interbedded graphitic schist, garnet-mica schist, staurolite schist, cross-biotite schist, and dark slate.

Granitic Gneiss (Late Middle Proterozoic) at surface, covers 0.2 % of this area

Granitic Gneiss (1192 my) - megacrystic, in places contains amphibolite.

Rocks of Brevard Fault Zone (Uncertain, possibly Permian or Devonian) at surface, covers 0.2 % of this area

Rocks of Brevard Fault Zone - "fish scale" schist and phyllonite, graphitic; interlayered with feldspathic metasandstone, marble lenses.

Metamorphosed Granitic Rock (Late Proterozoic) at surface, covers 0.2 % of this area

Metamorphosed Granitic Rock (680-710 my) - massive to foliated, locally mylonitic. Beech, Crossnore, Brown Mountain, Lansing, and other granitic rocks.

Lithology: granitoid; mylonite

Garnet-Mica Schist (Cambrian/Late Proterozoic) at surface, covers 0.2 % of this area

Garnet-Mica Schist - interlayered with amphibolite.

Granite Gneiss (Silurian/Ordovician) at surface, covers 0.2 % of this area

Granite Gneiss (438 my) - poorly foliated; interlayered with biotite augen gneiss.

Ashe Metamorphic Suite and Tallulah Falls Formation; Biotite gneiss (Late Proterozoic) at surface, covers 0.2 % of this area

Biotite gneiss - interlayered with biotite-garnet gneiss, biotite-muscovite schist, garnet-mica schist, and amphibolite.

Inequigranular Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 0.2 % of this area

Inequigranular Biotite Gneiss - weakly foliated to massive, contains plagioclase megacrysts and, rarely, larger megacrysts of quartz and feldspar.

Lithology: biotite gneiss

Metagraywacke, Amphibolite, and Kyanite Schist (Cambrian/Late Proterozoic) at surface, covers 0.2 % of this area

Metagraywacke, Amphibolite, and Kyanite Schist - metagraywacke (biotite gneiss) interlayered and gradational with amphibolite and kyanite schist; minor ultramafic and granitic rock.

Ocoee Supergroup, Great Smokey Group; Dean Formation (Late Proterozoic) at surface, covers 0.2 % of this area

Dean Formation - sericite schist with cross-biotite, staurolite, and garnet porphyroblasts; interbedded metagraywacke and quartz-pebble metaconglomerate.

Metagraywacke (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Metagraywacke - contains quartz and microcline porphyroblasts.

Chilhowee Group; Lower Chilhowee (Cambrian) at surface, covers 0.1 % of this area

Lower Chilhowee - feldspathic arenite, white to yellowish gray. Minor silty shale, feldspathic siltstone, and conglomerate in lower part. Includes Unicoi Formation of Hot Springs window.

Nantahala Formation and Tusquitee Quartzite, undivided (Late Proterozoic) at surface, covers 0.1 % of this area

Nantahala Formation and Tusquitee Quartzite, undivided - Nantahala Formation: slate and metasiltstone, dark gray, laminated to thin bedded, sulfidic; Tusquitee Quartzite: white to light yellowish gray, numerous, thin slate layers.

Ocoee Supergroup, Great Smokey Group; Slate of Copperhill Formation (Late Proterozoic) at surface, covers 0.1 % of this area

Slate of Copperhill Formation - slate to phyllite, dark gray, graphitic, sulfidic; includes metagraywacke with local graded bedding.

Granodioritic Gneiss (Middle Proterozoic) at surface, covers 0.1 % of this area

Granodioritic Gneiss (1175 my) - unconformity; greenish gray to pinkish gray, porphyroclastic to mylonitic; epidote, sericite, and chlorite common.

Lithology: granitic gneiss

Ocoee Supergroup, Snowbird Group; Longarm Quartzite (Late Proterozoic) at surface, covers 0.1 % of this area

Longarm Quartzite - cross-bedded, feldspathic, locally conglomeratic; includes dark slate and metasiltstone.

Cid Formation; Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

(southwest of Asheboro); Felsic Metavolcanic Rock - metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; interbedded with mafic and intermediate metavolcanic rock, meta-argillite, and metamudstone.

Amphibolite (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Amphibolite - equigranular, massive to well foliated, dioritic to basaltic dikes and sills; variably metamorphosed.

Lithology: amphibolite; basalt; diorite

Quartzite and Quartz-Muscovite Schist (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Quartzite and Quartz-Muscovite Schist - garnet, andalusite, kyanite, or sillimanite occur locally.

Lithology: quartzite; mica schist

Lineated Felsic Mica Gneiss (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Lineated Felsic Mica Gneiss - white to pink, with strong lineation of muscovite-biotite streaks and prismatic quartz aggregates; planar foliation and layering weak; minor mica schist and hornblende gneiss.

Blowing Rock Gneiss (Middle Proterozoic) at surface, covers 0.1 % of this area

Blowing Rock Gneiss (1000 my) - unconformity; abundant white potassic feldspar megacrysts in finely banded biotite schist, locally calcareous; interlayered with quartz-feldspar schist, calcareous biotite schist, phyllite, black slate, calcareous quartzite, sulfidic greenstone, and siliceous tuff.

Porphyroblastic Gneiss (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Porphyroblastic Gneiss - massive to foliated, granodioritic, migmatitic.

Lithology: gneiss

Ocoee Supergroup, Snowbird Group, undivided (Late Proterozoic) at surface, covers 0.1 % of this area

Snowbird Group, undivided - feldspathic metasiltstone, metasandstone, and phyllite. Basal schist contains lenses of quartz-pebble conglomerate.

Ocoee Supergroup, Snowbird Group; Roaring Fork Sandstone (Late Proterozoic) at surface, covers 0.1 % of this area

Roaring Fork Sandstone - greenish gray, fine to medium grained, locally cross-bedded, metamorphosed; interbedded metasiltstone and phyllite.

Meta-ultramafic Rock (Paleozoic/Late Proterozoic) at surface, covers 0.1 % of this area

Meta-ultramafic Rock - metamorphosed dunite and peridotite; serpentine, soapstone, and other altered ultramafic rock. Only larger bodies shown.

Chilhowee Group; Upper Chilhowee (Cambrian) at surface, covers 0.1 % of this area

Upper Chilhowee - vitreous quartz arenite, white to light gray; interbedded sandy siltstone and shale. Erwin and Hampton formations of Hot Springs window.

Lithology: arenite; siltstone; shale; sand

Toxaway Gneiss (Middle Proterozoic) at surface, covers < 0.1 % of this area

Toxaway Gneiss (1203 my) - unconformity; poorly foliated to well-foliated; equigranular to inequigranular, granitic.

Lithology: granitic gneiss

Max Patch Granite (Late Proterozoic) at surface, covers < 0.1 % of this area

Max Patch Granite - mottled pink and light green, coarse grained to porphyritic, massive; contains biotite.

Lithology: granite

Caesars Head Granite Gneiss (Devonian/Silurian) at surface, covers < 0.1 % of this area

Caesars Head Granite Gneiss (409 my) - equigranular to porphyritic, massive to well foliated; contains biotite and muscovite.

Lithology: granitic gneiss

Newark Supergroup, Dan River Group; Pine Hall Formation (Triassic) at surface, covers < 0.1 % of this area

Pine Hall Formation - sandstone, mudstone, and conglomerate, yellowish orange to brown.

Ocoee Supergroup, Great Smokey Group; Boyd Gap Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Boyd Gap Formation - dark gray, highly-sulfidic slate and metasiltstone interbedded and gradational with metagraywacke. Stratigraphic position uncertain. In Cherokee County includes upper part of Buck Bald Formation.

Coweeta Group (Late Proterozoic) at surface, covers < 0.1 % of this area

Coweeta Group - quartz dioritic gneiss, feldspar-quartz-biotite gneiss, metasandstone and quartzite, alumino-silicate schist, garnetiferous biotite gneiss, and minor amphibolite. Quartz dioritic gneiss predominant.

Grandfather Mountain Formation; Metasiltstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Felsic metavolcanic rocks and metasedimentary rocks (820my) - tentatively correlated with Grandfather Mountain Formation.

Ocoee Supergroup; Walden Creek Group, undivided (Late Proterozoic) at surface, covers < 0.1 % of this area

Walden Creek Group, undivided - slate to metasiltstone, locally limy beds and pods; interbedded with quartz-pebble metaconglomerate and metasandstone.

Shelton Granite Gneiss (Silurian) at surface, covers < 0.1 % of this area

Shelton Granite Gneiss (429 my) - poorly foliated; lineated granitic to quartz monzonitic gneiss.

Lithology: granitic gneiss

Grandfather Mountain Formation; Metasiltstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Metasiltstone - locally contains thin bedded iron-bearing dolomitic marble; interlayered with phyllite, metagraywacke, and meta-arkose.

Cid Formation; Mafic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

(Southwest of Asheboro); Mafic Metavolcanic Rock - metamorphosed basaltic flows and tuffs, dark green to black; interbedded with felsic and intermediate metavolcanic rock and metamudstone.

Newark Supergroup, Dan River Group; Cow Branch Formation (Triassic) at surface, covers < 0.1 % of this area

Cow Branch Formation - mudstone with minor sandstone, gray, laterally-continuous bedding. Intertongues with Stoneville and Pine Hall formations.

Lithology: mudstone; sandstone

Coweeta Group; Amphibolite (Middle/Late Proterozoic) at surface, covers < 0.1 % of this area

Amphibolite - equigranular, massive to well foliated, interlayered, rarely discordant, metamorphosed intrusive to extrusive mafic rock; may include metasedimentary rock.

Beaufort Formation, Undivided (Tertiary) at surface, covers < 0.1 % of this area

Beaufort Formation, Undivided - Unnamed upper member: sand and silty clay, glauconitic, fossiliferous, and locally calcareous. Jericho Run Member: siliceous mudstone with sandstone lenses, thin bedded; basal phosphatic pebble conglomerate.

Diabase (Jurassic) at surface, covers < 0.1 % of this area

Diabase - dikes, gray to black.

Lithology: diabase

Alligator Back Formation; Amphibolite (Late Proterozoic) at surface, covers < 0.1 % of this area

Amphibolite - equigranular, massive to well foliated, interlayered, rarely discordant, metamorphosed intrusive and extrusive mafic rock; may include metasedimentary rock.

Newark Supergroup, Dan River Group; Dan River Group, Undivided (Triassic) at surface, covers < 0.1 % of this area

Dan River Group, Undivided - basin-margin conglomerate and sandstone, red to brown, interfingering with basin-center sandstone and mudstone, green to brown. Conglomerate shown by pattern.

Banded Gneiss (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Banded Gneiss - interlayered with calc-silicate rock, metaconglomerate, amphibolite, sillimanite-mica schist, and granitic rock.

Megacrystic Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Megacrystic Biotite Gneiss - poorly layered to massive; megacrysts of microcline and quartz; local mica schist, amphibolite, and biotite gneiss

Rabun Gneiss (Ordovician) at surface, covers < 0.1 % of this area

Rabun Gneiss (450-500 my) - weakly to well foliated, granitic to quartz monzonitic.

Lithology: granitic gneiss

Grandfather Mountain Formation; Metasiltstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Greenstone - schistose to massive, amygdaloidal; interlayered with metasedimentary rocks. Includes Montezuma Member (metabasalt) in upper part.

Newark Supergroup, Chatham Group; Cumnock Formation (Triassic) at surface, covers < 0.1 % of this area

Cumnock Formation - sandstone and mudstone, gray to black; coal beds and carbonaceous shale. Grades into Pekin and Sanford formations.

Murphy Marble, Andrews Formation, and Nottely Quartzite, undivided (Late Proterozoic) at surface, covers < 0.1 % of this area

Murphy Marble, Andrews Formation, and Nottely Quartzite, undivided - Murphy Marble: calcareous to dolomitic; Andrews Formation: calcareous cross-biotite schist; Nottely Quartzite: meta-orthoquartzite with slate.

Lithology: marble; schist; quartzite; slate

Syenite of Concord Plutonic Suite (Devonian/Silurian) at surface, covers < 0.1 % of this area

Syenite of Concord Plutonic Suite (404 my) - includes the Concord ring dike.

Lithology: syenite

Amphibolite (Middle Proterozoic) at surface, covers < 0.1 % of this area

Amphibolite - unconformity; equigranular, massive to well foliated, interlayered, rarely discordant, metamorphosed intrusive to extrusive mafic rock; may include metasedimentary rock.

Grandfather Mountain Formation; Metasiltstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Metagraywacke - cross-bedding and graded bedding common, locally conglomeratic; interlayered with metasiltstone and phyllite.

Mount Rogers Formation; Metagraywacke (Late Proterozoic) at surface, covers < 0.1 % of this area

Metagraywacke - interlayered with metaconglomerate, laminated metasiltstone, and slate; minor calcareous metasandstone, greenstone, and metarhyolite.

Ocoee Supergroup, Great Smokey Group; Anakeesta Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Anakeesta Formation - slate to schist, dark gray, graphitic and sulfidic; includes interbedded argillaceous, feldspathic metagraywacke.

Ocoee Supergroup, Snowbird Group; Wading Branch Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Wading Branch Formation - sandy slate to coarse-grained pebbly metagraywacke with local graded bedding. Basal quartz-sericite schist or phyllite.

Mount Rogers Formation; Metafelsite (Late Proterozoic) at surface, covers < 0.1 % of this area

Metafelsite (820 my) - light-colored porphyritic extrusive rock.

Linville Metadiabase (Late Proterozoic) at surface, covers < 0.1 % of this area

Linville Metadiabase - metadiabase, greenstone, and amphibolite dikes and sills; massive to schistose.

Ocoee Supergroup, Great Smokey Group; Rich Butt Sandstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Rich Butt Sandstone - feldspathic; interbedded with dark argillaceous layers and laminae. Stratigraphic position uncertain.

Lithology: sandstone

Ocoee Supergroup, Snowbird Group; Pigeon Siltstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Pigeon Siltstone - thin bedded to laminated, commonly cross-bedded, metamorphosed; locally includes argillite and calcareous and arkeritic metasiltstone grading to silty metalimestone.

Ocoee Supergroup, Walden Creek Group; Sandsuck Formation (Late Proterozoic) at surface, covers < 0.1 % of this area

Sandsuck Formation - slate and metasiltstone, dark green to black. Metaconglomerate lentils in upper part; calcareous metasandstone, sandy metalimestone, and quartzite in lower part.

Ocoee Supergroup, Great Smokey Group; Phyllite (Late Proterozoic) at surface, covers < 0.1 % of this area

Phyllite - dark olive gray, graphitic and sulfidic.

Lithology: phyllite

Ashe Metamorphic Suite and Tallulah Falls Formation; Mica schist (Late Proterozoic) at surface, covers < 0.1 % of this area

Mica schist - locally sulfidic and graphitic; minor interlayered mica gneiss and amphibolite.

Shady Dolomite (Cambrian) at surface, covers < 0.1 % of this area

Shady Dolomite - light gray, fine grained, massive, locally thin bedded or ribboned.

Pee Dee Gabbro (Pennsylvanian) at surface, covers < 0.1 % of this area

Pee Dee Gabbro (314 my) - dark gray to black, medium to fine grained, massive.

Lithology: gabbro

Grandfather Mountain Formation; Metasiltstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Porphyritic felsic volcanic rock (820 my) - phyllitic to schistose, contains euhedral to subhedral phenocrysts of gray quartz and pink potassic feldspar. Resembles quartzite and meta-arkose.

Volcanic Metaconglomerate (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Volcanic Metaconglomerate - includes metagraywacke and metamudstone.

Grandfather Mountain Formation; Metasiltstone (Late Proterozoic) at surface, covers < 0.1 % of this area

Meta-arkose - sericitic, conglomeratic, locally cross-bedded; interlayered metasiltstone and slate.

Rome Formation (Cambrian) at surface, covers < 0.1 % of this area

Rome Formation - shale and siltstone, variegated red to brown; interbedded fine-grained sandstone and shaly dolomite.

Amphibolite (Middle Proterozoic) at surface, covers < 0.1 % of this area

Amphibolite - unconformity; equigranular, massive to well foliated, interlayered, rarely discordant, metamorphosed intrusive to extrusive mafic rock; may include metasedimentary rock.

Interlayered Mafic and Felsic Metavolcanic Rocks - Quartzofeldspathic biotite gneiss (Cambrian) at surface, covers < 0.1 % of this area

Interlayered Mafic and Felsic Metavolcanic Rocks - Quartzofeldspathic biotite gneiss

Biotite Gneiss (Proterozoic) at surface, covers < 0.1 % of this area

Biotite gneiss

Lithology: biotite gneiss

Phyllite and Metatuff (Proterozoic Z) at surface, covers < 0.1 % of this area

Phyllite and metatuff.

Biotite-Muscovite Granite (Proterozoic) at surface, covers < 0.1 % of this area

Biotite-muscovite granite

Lithology: granite

Bacons Castle Formation (Tertiary) at surface, covers < 0.1 % of this area

Bacons Castle Formation - Gravel grading upward into sand and sandy clayey silt

Lithology: gravel; sand; silt; clay or mud

Unicoi Formation (Cambrian) at surface, covers < 0.1 % of this area

Unicoi Formation - Sequence of gray feldspathic sandstone, arkose, conglomerate, graywacke, siltstone and shale; greenish amygdaloidal basalt flows near middle and base. Thickness 2,000 to 5,000 feet.

Aaron Slate (Proterozoic Z) at surface, covers < 0.1 % of this area

Aaron Slate - Phyllite and slate.

Cranberry Granite (Precambrian) at surface, covers < 0.1 % of this area

Cranberry Granite - Complex of intertonguing rock types including migmatite, granitic gneisses, monzonite, quartz diorite, greenstone, mica and hornblende schists, abundant granitic pegmatite.

Shirley Formation (Quaternary) at surface, covers < 0.1 % of this area

Shirley Formation - Interbedded gravel, sand, silt, clay, and peat; at altitudes to 35-45 ft. (top of unit).

Lithology: gravel; sand; silt; clay or mud; peat

Felsic Volcanic Rocks (Proterozoic Z) at surface, covers < 0.1 % of this area

Felsic volcanic rocks.

Persimmon Fork Formation (Cambrian to Neoproterozoic) at surface, covers < 0.1 % of this area

Persimmon Fork Formation: predominately metatuff

Lithology: metavolcanic rock

Mount Rogers Formation - Porphyritic felsite (Proterozoic Z) at surface, covers < 0.1 % of this area

Mount Rogers Formation - Porphyritic extrusive felsite

Interlayered Mafic and Felsic Metavolcanic Rocks - Foliated felsite (Cambrian) at surface, covers < 0.1 % of this area

Interlayered Mafic and Felsic Metavolcanic Rocks - Foliated felsite

Mylonite, Mylonite Gneiss, and Cataclastic Rocks (Proterozoic - Paleozoic ?) at surface, covers < 0.1 % of this area

Mylonite, mylonite gneiss, and cataclastic rocks.

Tuffaceous metasiltstone (Early Paleozoic-Neoproterozoic) at surface, covers < 0.1 % of this area

Tuffaceous metasiltstone

Beech Granite (Precambrian) at surface, covers < 0.1 % of this area

Beech Granite - Granite, porphyritic, light-gray to reddish; coarse potash feldspar crystals and clustered interstitial mafics (chloritized biotite and hornblende) give spotted appearance; includes Max Patch Granite.

Lithology: granite

Biotite gneiss and muscovite-biotite gneiss (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Biotite gneiss and muscovite-biotite gneiss: layered biotite-quartz-feldspar gneiss

Lithology: biotite gneiss

Virgilina Greenstone (Proterozoic Z) at surface, covers < 0.1 % of this area

Virgilina Greenstone - Greenstone metabasalt.

Lithology: greenstone

Gabbro- Mecklenburg pluton (Devonian to Silurian) at surface, covers < 0.1 % of this area

Gabbro- Mecklenburg pluton

Lithology: gabbro

Chatham Group, undivided (Triassic) at surface, covers < 0.1 % of this area

Chatham Group, undivided: conglomerate, sandstone and mudstone

Sillimanite-mica schist and muscovite-biotite schist (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Sillimanite-mica schist and muscovite-biotite schist: thin to thick layered sillimanite-mica schist and sillimanite-bearing muscovite-biotite schist

Lithology: mica schist

Phyllonite and phyllonitic schist (Late Paleozoic) at surface, covers < 0.1 % of this area

Phyllonite and phyllonitic schist

Lithology: phyllonite; schist

Felsic metavolcanic rocks and felsic gneiss interpreted to the metavolcanics (Ordovician to Neoproterozoic) at surface, covers < 0.1 % of this area

Felsic metavolcanic rocks and felsic gneiss interpreted to the metavolcanics

Interlayered Mafic and Felsic Metavolcanic Rocks - Quartz-muscovite schist and gneiss. (Cambrian) at surface, covers < 0.1 % of this area

Interlayered Mafic and Felsic Metavolcanic Rocks - Quartz-muscovite schist and gneiss.

Lithology: pelitic schist; gneiss

Great Smoky Group, including Anakeesta Formation, Thunderhead Sandstone, and Elkmont Sandstone (Precambrian) at surface, covers < 0.1 % of this area

Great Smoky Group - Characterized by very massive layers of coarse graywacke and arkose. The formations have been mapped only in the region of the Great Smoky Mountains. Near Ducktown, in ascending order, the Copperhill, Hughes Gap, Hothouse, and Dean Formations are recognized. Thickness 14,000 to about 40,000 feet. Includes Anakeesta Formation - Dark-gray, bluish-gray, and black slate with dark-gray interbeds of fine-grained sandstone. Thickness 3,000 to 4,500 feet; Thunderhead Sandstone - Coarse, gray feldspathic sandstone, graywacke, and conglomerate; occurs in massive ledges; graded bedding and blue quartz characteristic. Thickness 5,500 to 6,300 feet; Elkmont Sandstone - Coarse to fine, gray feldspathic sandstone, graywacke, and fine conglomerate; generally finer grained beds in lower part; graded bedding typical. Thickness 1,000 to 8,000 feet

Metadiorite (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Metadiorite

Lithology: diorite

Diorite and Quartz Diorite (Proterozoic) at surface, covers < 0.1 % of this area

Diorite and quartz diorite.

Lithology: diorite; quartz diorite

Granite (Proterozoic) at surface, covers < 0.1 % of this area

Granite

Lithology: granite; granodiorite

Metamorphosed quartz diorite to diorite (Early Paleozoic-Neoproterozoic) at surface, covers < 0.1 % of this area

Metamorphosed quartz diorite to diorite

Lithology: quartz diorite

Metamorphosed granite and granodiorite (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Metamorphosed granite and granodiorite

Lithology: granite; granodiorite

Porphyroblastic Biotite Granite (Proterozoic) at surface, covers < 0.1 % of this area

Porphyroblastic biotite granite

Lithology: granite

Hampton Formation (Cambrian) at surface, covers < 0.1 % of this area

Hampton Formation - Dark greenish-gray, silty and sandy, micaceous shale; numerous layers of medium-grained, feldspathic, thinly bedded sandstone. Thickness 500 to 2,000 feet.

Lithology: shale; sandstone

Migmatitic granitoid gneiss (Ordovician) at surface, covers < 0.1 % of this area

Migmatitic granitoid gneiss: variably foliated, variably migmatitic, and granitic to quartz dioritic in composition

Lithology: granitic gneiss

Cid Formation, Mudstone Member (Ordovician to Late Cambrian) at surface, covers < 0.1 % of this area

Cid Formation, Mudstone Member: thin bedded tuffaceous metasiltstone

Snowbird Group, including Pigeon Siltstone, Roaring Fork Sandstone, Metcalf Phyllite, Longarm Quartzite, and Wading Branch Formation (Precambrian) at surface, covers < 0.1 % of this area

Snowbird Group - The formations at right are applicable chiefly in the area of the Great Smoky Mountains. Thickness 13,000 to about 20,000 feet. Includes Pigeon Siltstone - Laminated, greenish quartzose and feldspathic siltstone; minor fine-grained gray sandstone. Thickness as much as 10,000 feet; Roaring Fork Sandstone - Interbedded massive feldspathic sandstone, greenish siltstone, and greenish phyllite. Maximum thickness 7,000 feet; Metcalf Phyllite - Lustrous, pale-green and silvery sericitic and chloritic phyllite; siltstone interbeds abundant. Thickness uncertain; at least 5,000 feet; Longarm Quartzite - Feldspathic quartzite and arkose, conspicuously light-colored, current bedded and crossbedded. Thickness about 5,000 feet; Wading Branch Formation - Medium- to dark-gray sandy slate to coarse, pebbly feldspathic sandstone and graywacke; basal part is quartz-sericite phyllite; graded bedding common. Thickness about 1,500 feet.

Rich Acres Formation (Cambrian) at surface, covers < 0.1 % of this area

Rich Acres Formation - Norite, metagabbro, and diorite.

Lithology: norite; gabbro; diorite

Marsh and Intertidal Mud Deposits (Quaternary) at surface, covers < 0.1 % of this area

Marsh and Intertidal Mud Deposits - Organic-rich clay and silt

Lithology: clay or mud; silt

Diorite Gneiss (Proterozoic) at surface, covers < 0.1 % of this area

Diorite gneiss

Lithology: gneiss

Buggs Island Pluton (Mississippian Pennsylvanian) at surface, covers < 0.1 % of this area

Buggs Island pluton - Granite

Lithology: granite

Felsic Volcanic and Volcaniclastic Rocks (Proterozoic Z) at surface, covers < 0.1 % of this area

Felsic volcanic and volcaniclastic rocks.

Pliocene Sand and Gravel (Tertiary) at surface, covers < 0.1 % of this area

Pliocene Sand and Gravel - Sandy gravel, gravelly sand, poorly to well-sorted sands, and thin- to medium-beds of clay and silt, at altitudes from 170-320 ft. (top of unit).

Lithology: gravel; sand; clay or mud; silt

Charles City Formation (Quaternary) at surface, covers < 0.1 % of this area

Charles City Formation - Interbedded sand, silt, clay and minor gravel; at altitudes to 70-80 ft. (top of unit).

Lithology: sand; silt; clay or mud; gravel

Fork Mountain Formation (Proterozoic Z-Cambrian) at surface, covers < 0.1 % of this area

Fork Mountain Formation - Quartzose mica schist, garnet-biotite gneiss, calc-silicate quartzite, and melange.

Hornblende-plagioclase Gabbro (Proterozoic) at surface, covers < 0.1 % of this area

Hornblende Gabbro in Carolina Slate Belt; Hornblende-Plagioclase Gabbro in Central Virginia Volcanic-Plutonic Belt; Gabbro, Hornblendite and Norite in Central Piedmont

Lithology: gabbro; norite

Leatherwood Granite (Cambrian) at surface, covers < 0.1 % of this area

Leatherwood Granite - Granite

Lithology: granite

Mafic and Felsic Volcanic Rocks (Proterozoic) at surface, covers < 0.1 % of this area

Mafic and felsic volcanic rocks

Lithology: metavolcanic rock

Interlayered Mafic and Felsic Metavolcanic Rocks - Amphibolite, hornblende-biotite gneiss, and schist. (Cambrian) at surface, covers < 0.1 % of this area

Interlayered Mafic and Felsic Metavolcanic Rocks - Amphibolite, hornblende-biotite gneiss, and schist.

Windsor Formation (Tertiary-Quaternary) at surface, covers < 0.1 % of this area

Windsor Formation - Interbedded gravel, sand, silt, and clay; at altitudes to 85-95 ft. (top of unit).

Lithology: gravel; sand; silt; clay or mud

Socastee Formation (Pleistocene) at surface, covers < 0.1 % of this area

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

Lithology: sand; clay or mud

Alluvium (Quaternary) at surface, covers < 0.1 % of this area

Alluvium - Poorly sorted organic material, clay, sand, and rounded pebbles and cobbles

Lithology: alluvium; clay or mud; sand

Duplin Formation (Pliocene) at surface, covers < 0.1 % of this area

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

Metavolcanic rocks, interlayered felsic to mafic, undivided (Ordovician to Neoproterozoic) at surface, covers < 0.1 % of this area

Metavolcanic rocks, interlayered felsic to mafic, undivided

Alligator Back Formation - Feldspathic metagraywacke (Proterozoic Z-Cambrian) at surface, covers < 0.1 % of this area

Alligator Back Formation - Meta-argillite is feldspathic metagraywacke; graphitic mica schist, and quartzite.

Peedee Formation /Black Creek Group, undivided (Cretaceous) at surface, covers < 0.1 % of this area

Peedee Formation /Black Creek Group, undivided

Lithology: clay or mud; sand; limestone

Biotite Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Biotite gneiss

Lithology: biotite gneiss

Alluvial Valley Swamp (Quaternary) at surface, covers < 0.1 % 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

Metagabbro and minor metadiorite (Middle Paleozoic to Neoproterozoic) at surface, covers < 0.1 % of this area

Metagabbro and minor metadiorite

Lithology: gabbro

Phyllite and Metasiltstone (Proterozoic Z) at surface, covers < 0.1 % of this area

Phyllite and metasiltstone.

Erwin Formation (Cambrian) at surface, covers < 0.1 % of this area

Erwin Formation - White, vitreous quartzite, massive, with interbeds of dark-green silty and sandy shale, minor siltstone, and very fine-grained sandstone. Thickness 1,000 to 1,500 feet.

Tabb Formtaion; Poquoson Member (Quaternary) at surface, covers < 0.1 % of this area

Tabb Formtaion; Poquoson Member - Pebbly sand grading upward into muddy, fine-grained sand and sandy silt, at altitudes to 11 ft. (top of unit).

Lithology: sand; silt

Aaron Slate (Proterozoic Z) at surface, covers < 0.1 % of this area

Aaron Slate - Metaconglomerate.

Lithology: meta-conglomerate

Mount Rogers Formation - Greenstone with interbedded sedimentary rocks (Proterozoic Z) at surface, covers < 0.1 % of this area

Mount Rogers Formation - Greenstone with sedimentary interbeds.

Beach Sand and Dune Sand Deposits (Quaternary) at surface, covers < 0.1 % of this area

Beach Sand and Dune Sand Deposits - Fine- to coarse-grained quartz sand, poorly to well-sorted.

Lithology: beach sand; dune sand

Waxhaw metagranite (Ordovician to Cambrian) at surface, covers < 0.1 % of this area

Waxhaw metagranite: metamorphosed fine- to medium-grained biotite granite and hypabyssal quartz porphyry, non-foliated except adjacent to Gold Hill and Waxhaw shear zones where it is gneissic to phyllonitic

Lithology: granite

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

Granite

Lithology: granite

Bassett Formation - Biotite gneiss and granite gneiss. (Proterozoic Z) at surface, covers < 0.1 % of this area

Bassett Formation - Quartzofeldspathic biotite gneiss and granite gneiss.

Metatonalite (Proterozoic) at surface, covers < 0.1 % of this area

Metatonalite

Bassett Formation - Amphibolite. (Proterozoic Z-Cambrian) at surface, covers < 0.1 % of this area

Bassett Formation - Amphibolite.

Lithology: amphibolite; gneiss; schist

Walden Creek Group; Sandsuck Formation (Precambrian) at surface, covers < 0.1 % of this area

Wladen Creek Group; Sandsuck Formation - Olive-green and gray, argillaceous, micaceous shale with coarse feldspathic sandstone and quartz- pebble conglomerate. Thickness about 2,000 feet.

Bakersville Gabbro (Precambrian) at surface, covers < 0.1 % of this area

Bakersville Gabbro - Metagabbro, dark, porphyritic; contains diorite, basalt, anorthosite, and diabase; occurs as thin to massive dikes and lenticular masses.

Caesars Head Granite (Ordovician to Silurian) at surface, covers < 0.1 % of this area

Caesars Head Granite: well foliated, banded to non-banded biotite granitoid gneiss or gneissic granitoid; cuts Seneca thrust fault

Lithology: granitic gneiss

Roan Gneiss (Precambrian) at surface, covers < 0.1 % of this area

Roan Gneiss - Layered hornblende and garnet gneiss and granitic migmatite with zones of mica schist and amphibolite, foliation commonly contorted; contains numerous granitic and gabbroic dikes.

Tabb Formation; Sedgefield Member (Quaternary) at surface, covers < 0.1 % of this area

Tabb Formation; Sedgefield Member - Pebbly to bouldery, clayey sand and shelly sand, at altitudes to 30 ft. (top of unit).

Lithology: sand