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Geologic units containing Mafic metavolcanic rock

Mafic metavolcanic rock
A metavolcanic rock having abundant dark-colored minerals, typically feldspar, amphibole, and/or pyroxene
Subtopics:
Greenstone
Metabasalt
Spilite

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Maine

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Amphibolite (Cambrian/Late Proterozoic)
Amphibolite - metamorphosed mafic extrusive and intrusive rock; includes hornblende gneiss, thin layers of mica schist, and small nonlayered masses of metadiorite and metagabbro.
Cid Formation; Felsic Metavolcanic Rock (Cambrian/Late Proterozoic)
(southwest of Asheboro); 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.
Cid Formation; Mafic Metavolcanic Rock (Cambrian/Late Proterozoic)
(Southwest of Asheboro); Mafic Metavolcanic Rock - metamorphosed basaltic flows and tuffs, dark green to black; interbedded with felsic and intermediate metavolcanic rock and metamudstone.
Felsic Metavolcanic Rock (Cambrian/Late Proterozoic)
Felsic Metavolcanic Rock - metamorphosed dacitic to rhyolitic flows and tuffs, light gray to greenish gray; minor mafic and intermediate metavolcanic rock.
Felsic Metavolcanic Rock (Cambrian/Late Proterozoic)
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.
Felsic Metavolcanic Rock (Cambrian/Late Proterozoic)
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.
Intermediate Metavolcanic Rock (Cambrian/Late Proterozoic)
Intermediate Metavolcanic Rock - metamorphosed andesitic tuffs and flows, medium to dark grayish green; minor felsic and mafic metavolcanic rock.
Intermediate Metavolcanic Rock (Cambrian/Late Proterozoic)
Intermediate Metavolcanic Rock - metamorphosed andesitic tuffs and flows, medium to dark grayish green; minor felsic and mafic metavolcanic rock.
Mafic Metavolcanic Rock (Cambrian/Late Proterozoic)
Mafic Metavolcanic Rock - metamorphosed basaltic to andesitic tuffs and flows, grayish green to black. Locally includes hypabyssal intrusives and minor felsic metavolcanic rock.
Mafic Metavolcanic Rock (Cambrian/Late Proterozoic)
Mafic Metavolcanic Rock - metamorphosed basaltic flows and tuffs, dark green to black; interbedded with felsic and intermediate metavolcanic rock and metamudstone.
Mafic Metavolcanic Rock (Cambrian/Late Proterozoic)
Mafic Metavolcanic Rock - metamorphosed basaltic flows and tuffs, dark green to black; interbedded with felsic and intermediate metavolcanic rock and metamudstone.
Metavolcanic Rock (Cambrian/Late Proterozoic)
Metavolcanic Rock - interbedded felsic to mafic tuffs and flowrock.
Metavolcanic Rock (Cambrian/Late Proterozoic)
Metavolcanic Rock - interbedded felsic to mafic tuffs and flowrock.
Uwharrie Formation; Felsic Metavolcanic Rock (Cambrian/Late Proterozoic)
(at Asheboro and to south); 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.
Yadkin Formation (Cambrian/Late Proterozoic)
Yadkin Formation - metamorphosed graywacke, volcanic sandstone, and siltstone; interbedded with mafic and intermediate metavolcanic flows and tuffs.

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