Walche Limestone Member
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
Name
Original description
The Walche Limestone Member of the Menard Formation (Swann, 1963, p. 38-39).
Derivation
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."
History/background
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.
Lithology
It is generally gray to dark gray limestone, typically silty or sandy, and pyritic in part.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
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
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