Usage:
Downeys Bluff Limestone of Paint Creek Group (IL-recognized in southwestern part)
Downeys Bluff Limestone of Cedar Bluff Group (IL-recognized in southeastern part)
Downeys Bluff Member of Renault Formation (KY)
Downeys Bluff Member of Paoli Limestone of Blue River Group (IN*)
Downeys Bluff Limestone Member of Paint Creek Formation (MO)
Geologic age:
Middle Mississippian (Visean; early Chesterian)*
Type section, locality, area and/or origin of name:
Downeys Bluff, in NW/4 SE/4 sec. 5, T. 13 S., R. 8 E., Hardin Co., southern IL (Atherton, 1947).
Reference section: exposure in streambed, in NW/4 NE/4 sec. 13, T. 35 N., R. 12 E., Perry Co., southeastern MO (Thompson, 1986).
AAPG geologic province:
Illinois basin*
Ozark uplift*
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 ([ ]).