Geologic units in Cabarrus county, North Carolina

Metamorphosed Quartz Diorite (Paleozoic/Late Proterozoic) at surface, covers 25 % of this area

Foliated to massive.

Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 19 % of this area

Interbedded felsic to mafic tuffs and flowrock.

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

Locally laminated and pyritic; includes phyllonite, sheared fine-grained metasediment, and metavolcanic rock. In Lilesville granite aureole, includes hornfels.

Gabbro of Concord Plutonic Suite (Devonian/Ordovician) at surface, covers 8 % of this area

Barber, Concord, Farmington, Mecklenburg, and Weddington intrusives.

Metamorphosed Mafic Rock (Paleozoic/Late Proterozoic) at surface, covers 8 % of this area

Metagabbro, metadiorite, and mafic plutonic-volcanic complexes.

Granite of Salisbury Plutonic Suite (Devonian/Silurian) at surface, covers 8 % of this area

Pink, massive to weakly foliated. Gold Hill, Kannapolis, Salisbury, Southmont, and Yadkin intrusives.

Floyd Church Formation; Metamudstone and Meta-Argillite (Cambrian/Late Proterozoic) at surface, covers 6 % of this area

(Southwest of Asheboro) Thin to thick bedded; bedding plane and axial-planar cleavage common; interbedded with metasandstone, metaconglomerate, and metavolcanic rock.

Syenite of Concord Plutonic Suite (Devonian/Silurian) at surface, covers 4 % of this area

Includes the Concord ring dike.

Granitic Rock (Permian/Pennsylvanian) at surface, covers 3 % of this area

Megacrystic to equigranular. Churchland Plutonic Suite (Western group) - Churchland, Landis, and Mooresville intrusives.

Cid Formation; Felsic Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 2 % of this area

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

Metamorphosed Granitic Rock (Cambrian/Late Proterozoic) at surface, covers 1 % of this area

Megacrystic, well foliated; locally contains hornblende.

Granitic Rock (Devonian/Ordovician) at surface, covers 0.9 % of this area

Locally pinkish gray, massive to weakly foliated; contains hornblende.

Quartzite (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Massive to well foliated; contains andalusite, kyanite, or sillimanite, chloritoid, and pyrite.

Yadkin Formation (Cambrian/Late Proterozoic) at surface, covers 0.1 % of this area

Metamorphosed graywacke, volcanic sandstone, and siltstone; interbedded with mafic and intermediate metavolcanic flows and tuffs.