Midway Group (AL*,AR*,FL*,GA*,IL*,KY*,LA*,MO*,MS*,TN*,TX*)
(alphabetical): Clayton Formation (AL*,AR*,GA*,IL*,KY*,LA*,MO*, MS*,TN*) or Clayton Limestone (MS), Kincaid Formation (AR*, LA*,TX*), Logansport Formation (TX), Naheola Formation (AL*,MS*), Porters Creek Clay (AL*,AR*,IL*,KY*,LA*,MO*,MS*,TN*,GA*) or Porters Creek Formation (AL*,GA*,MS), Wills Point Formation (AR*,TX*).
Exposures at Midway Landing and plantation on west side of Alabama River, about 5 mi below Prairie Bluff, in Wilcox Co., AL (Harris, 1894).
East Texas basin*
Ouachita folded belt*
Gulf Coast basin*
Black Warrior basin*
Mid-Gulf Coast basin*
Upper Mississippi embayment*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).