Fort Cassin Formation

Shown locally from Whitehall, N.Y., to Orwell, Vt. Laterally equivalent to Providence Island Dolostone. Part of the Beekmantown Group. Rocks of the Laurentian Margin. Part of the Adirondack lowlands and Lake Champlain lowlands (west of the Orwell and Champlain thrusts).
State Vermont
Name Fort Cassin Formation
Geologic age Middle and Lower Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > DolostoneLaterally equivalent to Providence Island Dolostone.
References
NGMDB product
Counties Addison - Rutland