Geologic units in Franklin county, North Carolina

Foliated to Massive Granitic Rock (Permian/Pennsylvanian) at surface, covers 50 % of this area

Megacrystic to equigranular. Rolesville suite, Wise and Lemon Springs (?) intrusives.

Granitic Rock (Permian/Pennsylvanian) at surface, covers 17 % of this area

Megacrystic to equigranular. Castalia and Wilton intrusives.

Biotite Gneiss and Schist (Cambrian/Late Proterozoic) at surface, covers 15 % of this area

Inequigranular and megacrystic; in places contains garnet; interlayered and gradational with mica schist and amphibolite; includes small masses of granitic rock.

Injected Gneiss (Cambrian/Late Proterozoic) at surface, covers 8 % of this area

Biotite gneiss and schist intruded by numerous sills and dikes of granite, pegmatite, and aplite; minor hornblende gneiss.

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

Contains garnet, staurolite, kyanite, or sillimanite; includes lenses and layers of quartz schist, micaceous quartzite, biotite gneiss, amphibolite, and phyllite.

Felsic Mica Gneiss (Cambrian/Late Proterozoic) at surface, covers 3 % of this area

Interlayered with graphitic mica schist and mica-garnet schist, commonly with kyanite; minor hornblende gneiss.

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

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.

Amphibolite (Cambrian/Late Proterozoic) at surface, covers 0.8 % of this area

Metamorphosed mafic extrusive and intrusive rock; includes hornblende gneiss, thin layers of mica schist, and small nonlayered masses of metadiorite and metagabbro.

Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 0.5 % of this area

Bedding plane and axial-planar cleavage common; interbedded with metasandstone, meta-conglomerate, and metavolcanic rock.

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

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

Granitic Rock (Permian/Pennsylvanian) at surface, covers 0.3 % of this area

Megacrystic to equigranular. Castalia, Lillington, Medoc Mountain, Sims, Contentnea Creek (?), and Elm City (?) intrusives.

Terrace Deposits and Upland Sediment (Tertiary) at surface, covers 0.1 % of this area

Gravel, clayey sand, and sand, minor iron-oxide cemented sandstone.

Metavolcanic-Epiclastic Rock (Cambrian/Late Proterozoic) at surface, covers < 0.1 % of this area

Metamorphosed argillite, mudstone, volcanic sandstone, conglomerate, and volcanic rock.