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Geologic units in Rockingham county, North Carolina

Newark Supergroup, Dan River Group; Stoneville Formation (Triassic) at surface, covers 12 % of this area
Stoneville Formation - conglomerate, sandstone, and mudstone, lenticular and laterally-gradational bedding.
Lithology: conglomerate; sandstone; mudstone
Biotite Gneiss and Schist (Cambrian/Late Proterozoic) at surface, covers 47 % 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.
Lithology: biotite gneiss; mica schist; amphibolite; calc-silicate rock; granite
Metamorphosed Granitic Rock (Ordovician/Cambrian) at surface, covers 0.2 % of this area
Metamorphosed Granitic Rock (455-540 my) - equigranular to megacrystic, foliated to massive. Includes Toluca Granite.
Lithology: metamorphic rock
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.
Lithology: metasedimentary rock; amphibolite; schist; ultramafic intrusive rock; granite
Felsic Mica Gneiss (Cambrian/Late Proterozoic) at surface, covers 10 % of this area
Felsic Mica Gneiss - interlayered with biotite and hornblende gneiss and schist.
Lithology: felsic gneiss; mafic gneiss; biotite gneiss; mica schist
Newark Supergroup, Dan River Group; Pine Hall Formation (Triassic) at surface, covers 4 % of this area
Pine Hall Formation - sandstone, mudstone, and conglomerate, yellowish orange to brown.
Lithology: sandstone; mudstone; conglomerate
Shelton Granite Gneiss (Silurian) at surface, covers 2 % of this area
Shelton Granite Gneiss (429 my) - poorly foliated; lineated granitic to quartz monzonitic gneiss.
Lithology: granitic gneiss
Amphibolite (Cambrian/Late Proterozoic) at surface, covers 0.2 % of this area
Amphibolite - equigranular, massive to well foliated, dioritic to basaltic dikes and sills; variably metamorphosed.
Lithology: amphibolite; basalt; diorite
Metamorphosed Granitic Rock (Late Proterozoic) at surface, covers 0.3 % 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
Mafic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 2 % of this area
Mafic Metavolcanic Rock - metamorphosed basaltic flows and tuffs, dark green to black; interbedded with felsic and intermediate metavolcanic rock and metamudstone.
Lithology: mafic metavolcanic rock; felsic metavolcanic rock; intermediate metavolcanic rock; metasedimentary rock
Bassett Formation - Amphibolite. (Proterozoic Z-Cambrian) at surface, covers < 0.1 % of this area
Bassett Formation - Amphibolite.
Lithology: amphibolite; gneiss; schist
Felsic Volcanic and Volcaniclastic Rocks (Proterozoic Z) at surface, covers < 0.1 % of this area
Felsic volcanic and volcaniclastic rocks.
Lithology: felsic volcanic rock; mixed clastic/volcanic
Newark Supergroup, Dan River Group; Cow Branch Formation (Triassic) at surface, covers 3 % of this area
Cow Branch Formation - mudstone with minor sandstone, gray, laterally-continuous bedding. Intertongues with Stoneville and Pine Hall formations.
Lithology: mudstone; sandstone
Metagraywacke and Muscovite-Biotite Schist (Cambrian/Late Proterozoic) at surface, covers 9 % of this area
Metagraywacke and Muscovite-Biotite Schist - metagraywacke (biotite gneiss) interlayered and gradational with muscovite-biotite schist; minor marble and granitic rock.
Lithology: metasedimentary rock; mica schist; marble; granite
Rich Acres Formation (Cambrian) at surface, covers < 0.1 % of this area
Rich Acres Formation - Norite, metagabbro, and diorite.
Lithology: norite; gabbro; diorite
Phyllite and Schist (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area
Phyllite and Schist - minor biotite and pyrite; includes phyllonite, sheared fine-grained metasediment and metavolcanic rock.
Lithology: phyllite; schist; phyllonite; metasedimentary rock; metavolcanic rock
Mica Schist (Cambrian/Late Proterozoic) at surface, covers 4 % 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.
Lithology: mica schist; quartzite; calc-silicate rock; biotite gneiss; amphibolite; phyllite
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.
Lithology: mica schist; gneiss; quartzite; melange
Granitic Rock (Permian/Pennsylvanian) at surface, covers 6 % of this area
Granitic Rock (265-325 my) - megacrystic to equigranular. Castalia, Lillington, Medoc Mountain, Sims, Contentnea Creek (?), and Elm City (?) intrusives.
Lithology: granite

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