Cedar Bluff Limestone Group

Lithostratigraphy: Pope Megagroup >>Cedar Bluff Limestone Group
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

Cedar Bluff Limestone Group (Swann, 1963, p. 63).

Derivation

Named for the quarry of the Cedar Bluff Limestone Company, formerly the Ohara quarry, southeast of Princeton, Caldwell County, Kentucky (S1/2 21-H-20).

History/background

It was originally called the Ohara Limestone, but the name Ohara is widely used for the Karnak Member of the Ste. Genevieve in the subsurface.

Stratigraphic relationships

The Valmeyeran-Chesterian contact falls within the Cedar Bluff Group at the top of the Levias Limestone Member of the Renault Formation.

Extent and thickness

It occurs in southeastern Illinois and is exposed in Hardin County.

Lithology

The Cedar Bluff Limestone Group consists of the Downeys Bluff, Yankeetown, and Renault Formations in areas where these formations are dominantly limestone (fig. M-25).

Fig. M-25 -- Columnar section of the Chesterian Series (after Swan, 1963), showing biozones (after Collinson et al., 1971). In the columnar section, the blank areas are shale.

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

Stratigraphic Code	Geo Unit Designation
4460	--