Hoosac Formation - Turkey Mountain metabasalt member

Dark-green to black, hornblende-plagioclase (±garnet±epidote) amphibolite and grayish-green epidote-plagioclase ankeritic greenstone; grades into epidote-quartz-plagioclase volcaniclastic wacke. Occurs as lenses at multiple stratigraphic levels. Lower layers are transitional and alkalic metabasalts; higher units are typical midocean ridge basalt (MORB)-type metabasalts. Eastern flank of the Green Mountain massif and eastern domes.
State Vermont
Name Hoosac Formation - Turkey Mountain metabasalt member
Geologic age Lower Cambrian and Neoproterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > GreenstoneGrayish-green epidote-plagioclase ankeritic greenstone.
Metamorphic > Amphibolite (Amphibolite epidote-amphibolite)Dark-green to black, hornblende-plagioclase (±garnet±epidote) amphibolite.
Minor
Sedimentary > Clastic > Sandstone > GraywackeGrades into epidote-quartz-plagioclase volcaniclastic wacke.
Metamorphic > Metaigneous > Metavolcanic > MetabasaltLower layers are transitional and alkalic metabasalts; higher units are typical midocean ridge basalt (MORB)-type metabasalts.
References
NGMDB product
Counties Addison - Bennington - Windham - Windsor