Eastern Slate Belt

EASTERN SLATE


METAMORPHIC ROCKS

Rocks of Eastem slate belt are partly covered by Ouatemary surficial sediment not shown on map. Bedrock contacts are inferred where concealed by sediment.
CZve - METAVOLCANIC-EPICLASTIC ROCK - Metamorphosed argillite, mudstone, volcanic sandstone, conglomerate, and volcanic rock
CZfv - 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
CZig - INJECTED GNEISS - Biotite gneiss and schist intruded by numerous sills and dikes of granite, pegmatite, and aplite; minor hornblende gneiss
CZiv - INTERMEDIATE METAVOLCANIC ROCK - Metamorphosed andesitic tuffs and flows, medium to dark grayish green; minor felsic and mafic metavolcanic rock.
CZmv - MAFIC METAVOLCANIC ROCK - Metamorphosed basaltic flows and tuffs, grayish green to black; interbedded with felsic and intermediate metavolcanic rock and metamudstone
CZq - QUARTZITE AND QUARTZ-MUSCOVITE SCHIST -- Garnet, andalusite, kyanite, or sillimanite occur locally
CZmd - METAMUDSTONE AND META-ARGILLITE - Bedding plane and axial-planar cleavage common; interbedded with metasandstone, metaconglomerate, and metavolcanic rock
CZph - PHYLLITE AND SCHIST - Minor biotite and pyrite; includes phylionite, sheared fine-grained metasediment, and metavolcanic rock

INTRUSIVE ROCKS

RHYOLITE - Dike, medium to dark gray, phenocrysts of sanidine, anorthoclase, and quartz; commonly with calcite or clay amygdules, not shown
DIABASE - Dikes, gray to black, not shown
PPg - GRANITIC ROCK - Megacrystic to equigranular. Castalia, Lillington, Medoc Mountain, Sims, Contentnea Creek (?), and Elm City (?) intrusives
PPmg - FOLIATED TO MASSIVE GRANITIC ROCK - Megacrystic to equigranular. Butterwood Creek intrusive and Rocky Mount intrusive suite
PzZq - METAMORPHOSED QUARTZ DIORITE - Foliated to massive
PzZg - METAMORPHOSED GABBRO AND DIORITE - Foliated to massive
PzZu - META-ULTRAMAFIC ROCK - Metamorphosed dunite and peridotite; serpentinite, soapstone, and other altered ultramafic rock. Only larger bodies shown
Czg - METAMORPHOSED GRANITIC ROCK - Megacrystic, well foliated; locally contains hornblende. Fountain intrusive

CRETACEOUS

Kb - 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
Km - MIDDENDORF FORMATION - Sand, sandstone, and mudstone, gray to pale gray with an orange cast, mottled; clay balls and iron-cemented concretions common, beds laterally discontinous, cross-bedding common
Kc - CAPE FEAR FORMATION - Sandstone and sandy mudstone, yellowish gray to bluish gray, mottled red to yellowish orange, indurated, graded and laterally continuous bedding, blocky clay, faint cross-bedding, feldspar and mica common

TERTIARY

Tt - TERRACE DEPOSITS AND UPLAND SEDIMENT - Gravel, clayey sand, and sand, minor iron-oxide cemented sandstone
Tpy - YORKTOWN FORMATION AND DUPLIN FORMATION, UNDIVIDED

Return to Geologic Map of North Carolina