Historical:Reelsville Limestone Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: Pope Megagroup >>West Baden Group >>Paint Creek Group >>Ridenhower Formation >>Reelsville Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Chesterian Series >>Gasperian Stage
Allostratigraphy: Kaskaskia Sequence


Elwood Atherton, Charles Collinson, and Jerry A. Lineback

Name Origin

The Reelsville Limestone Member of the Ridenhower Formation (Malott, 1919, p. 10-11), the uppermost member, is named for Reelsville, Putnam County, Indiana.

Type Section

The type section of the Reelsville Limestone Member is on the Eel River, just south of Reelsville, where the member is 2.5 feet thick.


The Reelsville is classified as a formation in Indiana. It is dominantly limestone but contains beds of shale. It is not differentiated in the type section of the Ridenhower Formation, and it has limited distribution in southeastern Illinois, mostly in subsurface. The Agassizocrinus cf. leavis Peak Zone is equivalent to the Reelsville Member.


MALOTT, C. A., 1919, "American Bottoms" region of eastern Greene County, Indiana-a type unit in southern Indiana physiography: Indiana University Studies, v. 6, 61 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation