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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.
Elwood Atherton, Charles Collinson, and Jerry A. Lineback
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.
Previously the Walche Limestone Member was called the "Little Menard."
The type section of the Walche Limestone Member is exposed at Walche's cut.
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.
The Walche is 3-9 feet thick.
It is generally gray to dark gray limestone, typically silty or sandy, and pyritic in part.
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SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.
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