Walche Limestone Member

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

Primary source

Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

Contributing author(s)

Elwood Atherton, Charles Collinson, and Jerry A. Lineback


Original description

The Walche Limestone Member of the Menard Formation (Swann, 1963, p. 38-39).


Named for Walche's cut on the Illinois Central Railroad in Caldwell County, Kentucky.

Other names

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


Type section

Type location

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

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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.

Extent and thickness

The Walche is 3-9 feet thick.


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




Well log characteristics


Age and correlation

Environments of deposition

Economic importance



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