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Clinton Group

Clinton Group - Herkimer Sandstone; Kirkland Hematite; Willowvale Shale; Westmoreland Hematite; Sauquoit Formation-sandstone, shale; Oneida Conglomerate.
State New York
Name Clinton Group
Geologic age Lower Silurian
Comments part of the Clinton Group 150-325 ft. (40-100 m). Descriptions from USGS Lexicon website (ref. NY046) and references NY018 and NY033: The Willowvale Shale is exactly equivalent to the Williamson Shale because both are bounded by the same biostratigraphically-dated discontinuity surfaces. Earlier correlations of the upper Willowvale with the Irondequoit are in error. The Williamson-Willowvale sequence records a major marine transgression with at least one major regressive subcycle. New litho- and biostratigraphic data support Gillette's (1947) original contention that the underlying Westmoreland Hematite is genetically related to the Willowvale. Age of both units is Early Silurian (late Llandoverian) (Lin and Brett, 1988). New biostratigraphic data suggest that unit is the same age (late Llandoverian) as the overlying Willowvale Shale and is zonally distinct from the underlying Sauquoit Shale. Westmoreland is laterally equivalent to Second Creek Bed, a new name for a phosphatic quartz pebble bed with abundant pyrite at the base of the Williamson Shale (Lin and Brett, 1988).
Primary rock type shale
Secondary rock type sandstone
Other rock types chemical; conglomerate
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Minor
Sedimentary > Clastic > Sandstone
Sedimentary > ChemicalKirkland Hematite, Westmoreland Hematite
Sedimentary > Clastic > Conglomerate
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.
Brett, C.E., Tepper, D.H., Goodman, W.M., LoDuca, S.T. and Eckert, Bea-Yeh, 1995, Revised stratigraphy and correlations of the Niagaran Provincial Series (Medina, Clinton, and Lockport Groups) in the type area of western New York: U.S. Geological Survey Bulletin, 2086, 66 p., Prepared in cooperation with the U.S. Environmental Protection Agency and the University of Rochester, Department of Earth and Environmental Sciences.
Lin, Bea-Yeh and Brett, C.E., 1988, Stratigraphy and disconformable contacts of the Williamson-Willowvale interval; revised correlations of the late Llandoverian (Silurian) in New York State: Northeastern Geology, v. 10, no. 3, p. 241-253.
USGS Geologic Names Lexicon (GEOLEX)