Historical:Walche 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 >>Menard Limestone >>Walche Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Chesterian Series >>Elviran Stage
Allostratigraphy: Kaskaskia Sequence


Elwood Atherton, Charles Collinson, and Jerry A. Lineback

Name Origin

The Walche Limestone Member of the Menard Formation (Swann, 1963, p. 38-39) is named for Walche's cut on the Illinois Central Railroad in Caldwell County, Kentucky.

Type Section

The type section of the Walche Limestone Member is exposed at Walche's cut.

Other Names

Previously the Walche Limestone Member was called the "Little Menard."

Extent and Thickness

The Walche is 3-9 feet thick.

Stratigraphic Position

The Walche is overlapped by the Scottsburg Member, and it is not recognized north of a curve running approximately from northern Wabash County through Wayne County to southwestern Franklin County, beyond which it appears to grade laterally into siltstone that is included in the Waltersburg Formation.


It is generally gray to dark gray limestone, typically silty or sandy, and pyritic in part.


SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation