Ammonoosuc Volcanics of Billings (1935) - sulfidic slate and phyllite

Dark-gray to grayish-black, rusty-weathering sulfidic slate and phyllite interlay-ered with felsic tuffs and minor sandy rocks; locally forms the base of the Ammonoosuc Volcanics. Stratified rocks of the Bronson Hill arch and Sawyer Mountain belt.
State Vermont
Name Ammonoosuc Volcanics of Billings (1935) - sulfidic slate and phyllite
Geologic age Upper and Middle Ordovician
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > SlateDark-gray to grayish-black, rusty-weathering sulfidic slate and phyllite.
Igneous > Volcanic > Felsic-volcanic (Pyroclastic-tuff)Interlayered with felsic tuffs and minor sandy rocks.
Metamorphic > Metasedimentary > Metaclastic > PhylliteDark-gray to grayish-black, rusty-weathering sulfidic slate and phyllite.
Minor
Sedimentary > Clastic > SandstoneInterlayered with felsic tuffs and minor sandy rocks.
References
NGMDB product