Genevievian Stage
Lithostratigraphy: Mammoth Cave Limestone Megagroup
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series >>Genevievian 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
Genevievian Stage (Swann, 1963, p. 20-21).
Derivation
Named for the Ste. Genevieve Limestone.
Other names
History/background
Type section
Type location
The type section of the Genevievian Stage is the same of that for the Ste. Genevieve Limestone which is in Ste. Genevieve, Missouri.
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
It is the only stage at present differentiated in the Valmeyeran Series and covers only the latest part of Valmeyeran time (fig. M-3). It consists of all the strata contemporaneous with the Ste. Genevieve Limestone where its top corresponds with the last occurrence of Platycrinites penicillus. The Platycrinites - Talarocrinus boundary is the basis for the time plane separating the Valmeyeran and Chesterian Series. It falls within the Renault Limestone at the top of the Levias Member. The base of the Genevievian Stage is less well defined, but in the Illinois Basin it is placed at the top of the St. Louis Limestone, which is the base of the Gnathodus bilineatus - Cavusgnathus charactus Zone, somewhat higher than the disappearance of Lithostrotion and Lithostrotionella with large corallites, where it was originally placed.
Extent and thickness
Lithology
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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