|Name||Nunda Formation, West Hill Formation|
|Geologic age||Upper Devonian|
Sedimentary > Clastic > Sandstone
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).|
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/
|Counties||Chemung - Schuyler - Steuben - Tioga|