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The Pine Mountain window contains the southernmost Grenville basement massif to be found in the Appalachians. Granulite- and upper-amphibolite-facies granitic gneisses that form the basement complex are isotopically dated at 1.1–1.0 Ga. Locally, the gneisses contain rare mafic injections and supracrustal and plutonic xenoliths. The Pine Mountain Group cover sequence nonconformably overlies Grenville basement and is interpreted to correlate with Blue Ridge units as follows: Halawaka/Sparks Schist = Ocoee Supergroup (Late Proterozoic, rift), Hollis Quartzite = Chilhowee Group (Late Proterozoic-Cambrian, rift-to-drift), and Chewacla Marble = Shady Dolomite (Cambro-Ordovician, drift). Facies variations within the sedimentary cover units were cited as evidence...

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