Hoosac Formation - undivided

Heterogeneous unit consisting mainly of dark-gray to medium-light-gray-weathering, white-plagioclase-studded schist, gray slabby quartz-rich muscovite (±garnet) schist, and layers of dark-gray biotitic quartzite and metawacke. Eastern flank of the Green Mountain massif and eastern domes.
State Vermont
Name Hoosac Formation - undivided
Geologic age Lower Cambrian and Neoproterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > MetagraywackeDark-gray biotitic quartzite and metawacke.
Metamorphic > Metasedimentary > Metaclastic > QuartziteDark-gray biotitic quartzite.
Metamorphic > Schist > Mica-schist > Muscovite-schistDark-gray to medium-light-gray-weathering, white-plagioclase-studded schist, gray slabby quartz-rich muscovite (±garnet) schist.
References
NGMDB product
Counties Addison - Rutland - Windham - Windsor