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Walloomsac Formation

Walloomsac Formation - slate, phyllite, schist, metagraywacke.
StateNew York
NameWalloomsac Formation
Geologic ageMiddle Ordovician
Original map labelOwl
Commentspart of Lorraine, Trenton, and Black River Groups up to 4500 ft. (1400 m).
Primary rock typeslate
Secondary rock typephyllite
Other rock typesschist; metasedimentary rock
Lithologic constituents
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.
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 coverageColumbia - Dutchess - Putnam - Rensselaer - Washington

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