Poughquag Quartzite

(includes local Dalton Formation at base)-locally conglomeratic.
State New York
Name Poughquag Quartzite
Geologic age Cambrian
Lithologic constituents
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Sedimentary > Clastic > Conglomeratelocally conglomeratic
Comments part of Wappinger and Stockbridge Groups, Poughquag Quartzite, and Metamorphic Equivalents up to 4000 ft. (1200 m). Secondary unit description from USGS Lexicon website (ref. NY046) and reference NY042: Poughquag is shown as basal formation of Wappinger Group, conformably underlying Stissing Dolomite and nonconformably overlying Precambrian basement. The Wappinger is assigned to the Sauk Sequence in this report. Age is Early Cambrian (Sanders, 1995).

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.

Sanders, J.E., 1995, Lower Paleozoic carbonate-clast diamictites; relationship to thrust sheets that advanced across the floor of the northern Appalachian Ordovician foreland basin: Northeastern Geology and Environmental Sciences, v. 17, no.1, p. 23-45.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/


NGMDB product
Counties Dutchess - Orange - Putnam - Rockland - Westchester