- Usage in publication:
-
- Cedar Bluff Group
- Modifications:
-
- Named
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Illinois basin
Summary:
Named as a group within the Mammoth Caves Megagroup. Proposed for Downeys Bluff, Yankeetown, and Renault Formations where the formations are dominantly limestone. Name is exact objective synonym of Ohara. Reinstatement of Ohara in its original meaning would cause confusion because Ohara now has widespread informal use in subsurface of deeper part of basin for an earlier unit (Karnak Member of Ste. Genevieve). Lies between Aux Vases and Bethel Sandstone. 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 ([ ]).