Elviran Stage

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Lithostratigraphy: Pope Megagroup
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

Elviran Stage (Swann, 1963, p. 23, 65), originally called the Elvira Group (J. M. Weller, 1939).


Named for Elvira Township, Johnson County (12S-2E).

Other names


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Stratigraphic relationships

The Elviran Stage is the youngest stage of the Chesterian Series. It includes the nine formations younger than the Glen Dean Limestone (fig. M-25).

Extent and thickness


The limestones of the Elviran Stage are generally darker and finer grained and contain more silt and argillaceous material and less abundant fossils than the older Chesterian limestones.




Well log characteristics


Representative fossils include Pentremites fohsi, Pterotocrinus menardensis, Composita subquadrata, Eumetria costata, and Sulcatopinna missouriensis.

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.
WELLER, J. M., 1939, Mississippian System: Kansas Geological Society Guidebook, 13th Annual Field Conference, southwestern Illinois and southeastern Missouri, p. 131-137.

ISGS Codes

Stratigraphic Code Geo Unit Designation