Usage:
Ullin Limestone (IL,IN,KY)
Ullin Limestone of Mammoth Cave Group (IL-notably southeastern part)
Subunits:
Ramp Creek Member (IL,IN) and Harrodsburg Member (IL)
Geologic age:
Mississippian, Early
Osagean
Mississippian, Late
Meramecian
Type section, locality, area and/or origin of name:
Type section: compiled from exposures in secs. 14, 21, and 22, T. 14 S., R. 1 W., Alexander and Pulaski Cos., IL. Named from town in Pulaski Co., IL (Lineback, 1966).
AAPG geologic province:
Illinois 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 ([ ]).