Valcour, Crown Point, and Day Point Limestones

Locally reefy, Ste. Therese Siltstone at base; Middlebury Limestone in Vermont; St. Martin and Rockcliffe Limestones in St. Lawrence Valley. Includes some Otbr and Obk adjacent to Champlain Thrust in Vermont.
State New York
Name Valcour, Crown Point, and Day Point Limestones
Geologic age Middle Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Reef)limestones - locally reefy
Minor
Sedimentary > Clastic > SiltstoneSte. Therese Siltstone at base
Comments Chazy Group 0-725 ft. (0-221 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 - Orange - Saint Lawrence