Mineral Resources On-Line Spatial Data
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.
- Diabase (Jurassic) at surface, covers 3 % of this area
Diabase - dikes, gray to black.
- 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.
- Metamorphosed Gabbro and Diorite (Paleozoic/Late Proterozoic) at surface, covers 1.0 % of this area
Metamorphosed Gabbro and Diorite - foliated to massive.
- 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.
- 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.
- 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.