Beekmantown Group (in part) (NYObk;1)

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
Original map label	Obk
Comments	part of Beekmantown Group, Potsdam Sandstone, and Vermont Valley Sequence up to 2500 ft. (760 m).
Primary rock type	dolostone (dolomite)
Secondary rock type	limestone
Other rock types	chert; siltstone
Lithologic constituents	Major Sedimentary > Carbonate > Limestone Sedimentary > Carbonate > Dolostone Incidental Sedimentary > Clastic > Siltstone Sedimentary > Chemical > Chert
Map references	NYS Museum, NYS Geological Survey, NYS Museum Technology Center, 1999, 1:250,000 Bedrock geology of NYS, data is distributed in ARC/INFOr EXPORT format (with ".e00" extension) in 5 seperate files based on printed map sheets, http://www.nysm.nysed.gov/gis.html. [http://www.nysm.nysed.gov/gis.html.]
Unit references	D. W. Fisher; Y. W. Isachsen, L. V. Rickard, 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 1:250000.
Geographic coverage	Cayuga - Clinton - Essex - Franklin - Fulton - Herkimer - Jefferson - Monroe - Montgomery - Niagara - Orleans - Oswego - Rensselaer - Saint Lawrence - Saratoga - Schenectady - Warren - Washington - Wayne