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  • Usage in publication:
    • Winspear Submember
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Appalachian basin
Publication:

McCollum, L.B., 1991, Revised stratigraphy, sedimentology, and paleoecology of the Ledyard Member, Ludlowville Formation, New York, IN Landing, Ed, and Brett, C.E., eds., Dynamic stratigraphy and depositional environments of the Hamilton Group (Middle Devonian) in New York State, Part II: New York State Museum Bulletin, no. 469, p. 107-128.


Summary:

Ledyard Member of Ludlowville Formation of Hamilton Group subdivided into newly named /Winspear and overlying /Elma submembers. The Winspear (formerly designated Alden Member by McCollum, 1980, PhD dissertation) encompasses the lower 15 m of the Ledyard and is a uniform dark gray shale with numerous limy concretionary layers. Includes the distinctive Alden pyrite beds 8 m above its base and the Athol Springs limestone bed, which defines its top. Overlies the Centerfield Limestone Member. Age is Middle Devonian.
["Submember" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). Considered informal until formally published. The rank or lithologic term should not be capitalized.]

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


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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