Fort Ann Formation

(Shown only in New York State). Medium- to dark-gray and mottled, medium- to thick-bedded dolomitic limestone and buff-weathering 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 Ann Formation
Geologic age Lower Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)Medium- to dark-gray and mottled, medium- to thick-bedded dolomitic limestone.
Sedimentary > Carbonate > Dolostone (Bed)Medium- to dark-gray and mottled, medium- to thick-bedded dolomitic limestone and buff-weathering dolostone.
References
NGMDB product
Counties Rutland