- Usage in publication:
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- Armstrong Hill Member
- Modifications:
-
- Named
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Cincinnati arch
Summary:
The Armstrong Hill Member of the Slade Formation, used informally by Ettensohn (1977) and here named, consists predominantly of calcilutite with thin shale partings. The Armstrong Hill was previously assigned to the Newman Limestone, which is here excluded from the Cumberland Plateau area of east-central and northeastern KY. Conformably overlies the Cave Branch Bed of the Slade; unconformably underlies the Holly Fork or Tygarts Creek Members, although local intertonguing may occur with these units. Thickness ranges from 0 to 5 m. Age is Late 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 ([ ]).