Copake and Rochdale Formations (NYOw;3)

State	New York
Name	Copake and Rochdale Formations
Geologic age	Lower Ordovician
Original map label	Ow
Comments	part of Wappinger and Stockbridge Groups, Poughquag Quartzite, and Metamorphic Equivalents up to 4000 ft. (1200 m).
Primary rock type	limestone
Secondary rock type	dolostone (dolomite)
Other rock types	siltstone; chert
Lithologic constituents	Major Sedimentary > Carbonate > Limestone Minor Sedimentary > Clastic > SiltstoneCopake Formation Sedimentary > Carbonate > Dolostone Incidental Sedimentary > Chemical > ChertHalcyon Lake Dolostone-locally cherty.
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.