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  • Usage in publication:
    • Halls Gap Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Siltstone
  • AAPG geologic province:
    • Cincinnati arch
Publication:

Weir, G.W., Gualtieri, J.L., and Schlanger, S.O., 1966, Borden Formation (Mississippian) in south- and southeast-central Kentucky, IN Contributions to stratigraphy, 1965: U.S. Geological Survey Bulletin, 1224-F, p. F1-F38.


Summary:

Named Halls Gap Member of Borden Formation. Made up of resistant limy siltstone with minor shaly siltstone and silty limestone. The fresh rock is chiefly medium gray to greenish gray, generally in obscure rough beds about a foot thick. Lenticular concretions of finely crystalline limestone about a foot thick and a few feet long, geodes of white chert a fraction of an inch to several inches in diameter, and nodules of pyrite less than 1 inch in diameter are sparse to common. Fossil fragments common to abundant in very limy siltstone and silty limestone. Underlain by Nancy Member and overlain by Wildie or Muldraugh Member of Borden Formation. Age is Early Mississippian.

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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