Hoosac Formation - biotite phyllite member

Coal-black, lustrous, rusty- to non-rusty-weathering, biotite-muscovite-plagioclase-quartz schist and phyllite, containing lenses of white laminated quartzite as beds and discoidal boudins. Eastern flank of the Green Mountain massif and eastern domes.
State Vermont
Name Hoosac Formation - biotite phyllite member
Geologic age Lower Cambrian and Neoproterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Schist > Mica-schistCoal-black, lustrous, rusty- to non-rusty-weathering, biotite-muscovite-plagioclase-quartz schist and phyllite
Minor
Metamorphic > Metasedimentary > Metaclastic > QuartziteContaining lenses of white laminated quartzite as beds and discoidal boudins.
References
NGMDB product
Counties Bennington - Windham