Poultney Formation

Dull-white and whitish-gray-weathering, and pale-green and gray, thinly bedded to laminated slate and phyllite. Has distinctive beds, 1 cm to several centimeters thick, of siliceous argillite and metasiltstone and locally abundant thin beds of micritic black limestone near the base, interbedded with dark slate. Contains graptolites ranging from Ibexian to Whiterockian (Berry, 1961). Rocks of the Giddings Brook, Sunset Lake, and Bird Mountain slices. Part of the Taconic Allochthon.
State Vermont
Name Poultney Formation
Geologic age Middle and Lower Ordovician
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > SlateDull-white and whitish-gray-weathering, and pale-green and gray, thinly bedded to laminated slate and phyllite.
Metamorphic > Metasedimentary > Metaclastic > PhylliteDull-white and whitish-gray-weathering, and pale-green and gray, thinly bedded to laminated slate and phyllite.
Minor
Metamorphic > Metasedimentary > Metaclastic > ArgilliteSiliceous argillite and metasiltstone.
Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneSiliceous argillite and metasiltstone.
Sedimentary > Carbonate > LimestoneLocally abundant thin beds of micritic black limestone near the base.
References
NGMDB product
Counties Bennington - Rutland