|Geologic age||Cambrian - Lower Ordovician|
|Comments||part of Beekmantown Group, Potsdam Sandstone, and Vermont Valley Sequence up to 2500 ft. (760 m). Secondary unit description from USGS Geologic Names lexicon (ref. NY046): Named Theresa formation in central and eastern NY. Consists of somewhat calcareous, sandy dolomites with interbedded weak sandstones, especially near base. Thickness is 20 to 70 feet. Very closely related to underlying Potsdam sandstone and formerly included in Potsdam but here separated as distinct formation. Base drawn at base of first dolomite layer. Unconformably underlies the Pamelia limestone (of Chazy age) in Theresa and Alexander Bay quadrangles, Jefferson County. The Theresa is of Late Cambrian age.|
|Primary rock type||dolostone (dolomite)|
|Secondary rock type||sandstone|
|Other rock types|
Sedimentary > Carbonate > Dolostone
Sedimentary > Clastic > Sandstone
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.
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.
|Counties||Clinton - Franklin - Jefferson - Lewis - Saint Lawrence|