Gile Mountain Formation - rhythmically graded member

Light- to medium-gray, fine-grained micaceous quartzite to dark-gray muscovite-quartz-biotite carbonaceous phyllite or schist in beds 10 to 25 cm thick; and dark-gray micaceous phyllite or schist containing beds of micaceous quartzite; locally thickly bedded. Detrital volcanic zircons yield a U-Pb age of 409±5 Ma, no. 51 (McWilliams and others, 2010). Part of the Connecticut Valley Trough.
State Vermont
Name Gile Mountain Formation - rhythmically graded member
Geologic age Lower Devonian
Lithologic constituents
Major
Metamorphic > Schist > Mica-schistDark-gray muscovite-quartz-biotite carbonaceous phyllite or schist in beds 10 to 25 cm thick; and dark-gray micaceous phyllite or schist.
Metamorphic > Metasedimentary > Metaclastic > QuartziteLight- to medium-gray, fine-grained micaceous quartzite.
Metamorphic > Metasedimentary > Metaclastic > PhylliteDark-gray muscovite-quartz-biotite carbonaceous phyllite or schist in beds 10 to 25 cm thick; and dark-gray micaceous phyllite or schist.
References
NGMDB product
Counties Caledonia - Orange - Orleans - Washington - Windsor