Allard Limestone Member
Lithostratigraphy: Pope Megagroup >>Menard Limestone >>Allard 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 Allard Limestone Member of the Menard Formation (Swann, 1963, p. 38-40).
Derivation
Named for Allard College School, Johnson County.
Other names
History/background
Type section
Type location
The Allard Limestone Member is located 2.2 miles southwest of Allard College School, Johnson County, in a cut at the south end of the Illinois Central Railroad tunnel (SW NW NE 1, 13S-4E).
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
Extent and thickness
The Allard ranges from a little more than 30 feet in the far south to 10-12 feet in much of the northern area of the Menard.
Lithology
The Allard Member is dominantly limestone.
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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