Carlinville Limestone Member of Patoka Formation of McLeansboro Group (IL-local)
Late Pennsylvanian (Missourian)*
Type locality: outcrops in vicinity of Carlinville, in SW/4 SW/4 sec. 35, T. 10 N., R. 7 W., Carlinville 15-min quadrangle, Macoupin Co. southwestern IL (Wanless, 1956).
Illinois basin*
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