Usage:
Porters Creek Clay of Midway Group (AL*,AR*,IL*,KY*,LA*,MO*,MS*,TN*)
Porters Creek Formation of Midway Group (AL*,GA*,MS)
Porters Creek Formation (IL)
Subunits:
Matthews Landing Marl Member (AL*,MS*), Tippah Sand Lentil (MS*,TN).
Geologic age:
early Tertiary (Paleocene; Midwayan Provincial Age)*
Type section, locality, area and/or origin of name:
Named from exposures on Porters Creek, Hardeman Co., southwestern TN (Safford, 1864).
AAPG geologic province:
Upper Mississippi embayment*
Illinois basin*
South Georgia sedimentary province*
Black Warrior basin*
Mid-Gulf Coast basin*
Arkla basin*
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 ([ ]).