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National Geologic Map Database

Geologic Unit: Ullin

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 ([ ]).