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National Geologic Map Database
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  • Usage in publication:
    • Willowvale Shale
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

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.


Summary:

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).

Source: GNU records (USGS DDS-6; Reston GNULEX).


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