Geologic units in Mecklenburg county, North Carolina

Metamorphosed Quartz Diorite (Paleozoic/Late Proterozoic) at surface, covers 45 % of this area

Foliated to massive.

Metavolcanic Rock (Cambrian/Late Proterozoic) at surface, covers 18 % of this area

Interbedded felsic to mafic tuffs and flowrock.

Granitic Rock (Devonian/Ordovician) at surface, covers 14 % of this area

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

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

Metagabbro, metadiorite, and mafic plutonic-volcanic complexes.

Gabbro of Concord Plutonic Suite (Devonian/Ordovician) at surface, covers 7 % of this area

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

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

Metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; minor mafic and intermediate metavolcanic rock.

Quartzite (Cambrian/Late Proterozoic) at surface, covers 2 % of this area

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

Metamorphosed Granitic Rock (Cambrian/Late Proterozoic) at surface, covers 0.9 % of this area

Megacrystic, well foliated; locally contains hornblende.

Fine-grained Biotite Gneiss (Cambrian/Late Proterozoic) at surface, covers 0.8 % of this area

Massive to strongly foliated; minor layers of amphibolite and muscovite schist.

Syenite of Concord Plutonic Suite (Devonian/Silurian) at surface, covers 0.2 % of this area

Includes the Concord ring dike.

Metamorphosed Gabbro and Diorite (Paleozoic/Late Proterozoic) at surface, covers 0.2 % of this area

Foliated to massive.

Phyllite and Schist (Cambrian/Late Proterozoic) at surface, covers 0.2 % of this area

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

Granite of Salisbury Plutonic Suite (Devonian/Silurian) at surface, covers 0.2 % of this area

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

Metamorphosed quartz diorite to diorite (Early Paleozoic-Neoproterozoic) at surface, covers < 0.1 % of this area

Metamorphosed quartz diorite to diorite

Metamorphosed granite and granodiorite (Cambrian or Neoproterozoic) at surface, covers < 0.1 % of this area

Metamorphosed granite and granodiorite

Metagabbro and minor metadiorite (Middle Paleozoic to Neoproterozoic) at surface, covers < 0.1 % of this area

Metagabbro and minor metadiorite

Gabbro - Mecklenburg pluton (Devonian to Silurian) at surface, covers < 0.1 % of this area

Gabbro - Mecklenburg pluton

Felsic metavolcanic rocks and felsic gneiss interpreted to the metavolcanics (Ordovician to Neoproterozoic) at surface, covers < 0.1 % of this area

Felsic metavolcanic rocks and felsic gneiss interpreted to the metavolcanics

Metavolcanic rocks, interlayered felsic to mafic, undivided (Ordovician to Neoproterozoic) at surface, covers < 0.1 % of this area

Metavolcanic rocks, interlayered felsic to mafic, undivided