Beekmantown Group (in part)

In St. Lawrence Valley: Ogdensburg Dolostone (Beauharnois Dolostone in Canada); In Champlain Valley: Providence Island Dolostone; Fort Cassin Formation-limestone, dolostone; Fort Ann Formation (Spellman of Clinton and Essex Counties)-limestone, dolostone; Cutting Formation-dolostone (locally cherty), limestone, siltstone. In Vermont: includes Bridport, Bascom, Cutting, and Shelburne carbonates.
State New York
Name Beekmantown Group (in part)
Geologic age Lower Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Dolostone
Sedimentary > Carbonate > Limestone
Incidental
Sedimentary > Chemical > Chert
Sedimentary > Clastic > Siltstone
Comments part of Beekmantown Group, Potsdam Sandstone, and Vermont Valley Sequence up to 2500 ft. (760 m).
References

Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 1970, Geologic Map of New York State, consisting of 5 sheets: Niagara, Finger Lakes, Hudson-Mohawk, Adirondack, and Lower Hudson, New York State Museum and Science Service, Map and Chart Series No. 15, scale 1:250,000.

NGMDB product
Counties Clinton - Essex - Franklin - Saint Lawrence - Warren - Washington