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

Geologic units in Durham county, North Carolina

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

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

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

Diabase (Jurassic) at surface, covers 3 % of this area

Diabase - dikes, gray to black.

Lithology: diabase

Intermediate Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 5 % of this area

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

Lithology: intermediate metavolcanic rock; felsic metavolcanic rock; mafic metavolcanic rock

Metamorphosed Gabbro and Diorite (Paleozoic/Late Proterozoic) at surface, covers 1.0 % of this area

Metamorphosed Gabbro and Diorite - foliated to massive.

Lithology: metamorphic rock

Metamorphosed Granitic Rock (Cambrian/Late Proterozoic) at surface, covers 7 % 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 20 % 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.

Lithology: felsic metavolcanic rock; mafic metavolcanic rock; intermediate metavolcanic rock; meta-argillite; metasedimentary rock

Newark Supergroup, Chatham Group; Chatham Group, Undivided (Triassic) at surface, covers 63 % of this area

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

Lithology: conglomerate; sandstone; mudstone