Nunda Formation, West Hill Formation

Nunda: sandstone, shale; West Hill: shale, siltstone; Corning Shale.
State New York
Name Nunda Formation, West Hill Formation
Geologic age Upper Devonian
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone
Minor
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Mudstone > Shale
Comments part of West Falls Group 1100-1600 ft. (340-490 m). Second description from USGS Lexicon website (ref. NY046) and reference NY020: In western NY, the Nunda Member of the West Falls Formation generally includes two packets of sandstone beds--one at the base and one near the top. Total number of sandstone beds varies from one to eight and total thickness varies from 0 to 38 m. Authors include in the Nunda the intertonguing shales of the Angola for ease of analysis. Unit is most likely a submarine fan deposit as the sandstones are generally thick, massive to wavy/flaggy-bedded, have few primary sedimentary structures, terminate abruptly, and appear to have lobate forms (Jacobi and others, 1994).
References

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.

Jacobi, Robert, Gutmann, Michael, Piechocki, A.I., Singer, Jill, O'Connell, Suzanne and Mitchell, Charles, 1994, Upper Devonian turbidites in western New York; preliminary observations and implications, IN Landing, Ed, ed., Studies in stratigraphy and paleontology in honor of Donald W. Fisher: New York State Museum Bulletin, no. 481, p. 101-115.

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

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NGMDB product
Counties Chemung - Schuyler - Steuben - Tioga