Valcour Formation

Dark- to light-gray fossiliferous limestone. Part of the Chazy Group. Rocks of the Laurentian Margin. Part of the Adirondack lowlands and Lake Champlain lowlands (west of the Orwell and Champlain thrusts). Also part of the Vermont Valley sequence and Middlebury synclinorium (above the Orwell and Champlain thrusts).
State Vermont
Name Valcour Formation
Geologic age Upper Ordovician
Lithologic constituents
Sedimentary > Carbonate > LimestoneDark- to light-gray fossiliferous limestone.
NGMDB product
Counties Addison - Grand Isle