Golconda Group

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Lithostratigraphy: Pope Megagroup >>Golconda Group
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Chesterian Series >>Gasperian 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

Golconda Group (Brokaw, 1916, pl. 3; Ulrich, in Butts, 1917, p. 91-95; Swann, 1963, p. 68).


Named for Golconda, Pope County.

Other names


Type section

Type location

The type section of the Golconda Group is in the bluffs of the Ohio River above Golconda (secs. 5, 8, 18, 13S-7E).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Golconda Group is a limestone-shale unit, but it has a sandstone member locally present in its lower part in the northeastern part of its area. It consists of the Beech Creek Limestone at the base, the Fraileys Shale, and the Haney Limestone (fig. M-25).

Extent and thickness

The Golconda Group ranges from about 60 feet thick near its northern limit to over 180 feet near its southern limit.





Well log characteristics


Age and correlation

Environments of deposition

Economic importance



BROKAW, A. D., 1916, Preliminary oil report on southern Illinois: Illinois State Geological Survey Extract Bulletin 35, 13 p.
BUTTS, CHARLES, 1917, Descriptions and correlations of the Mississippian formations of western Kentucky, Part I of Mississippian formations of western Kentucky: Kentucky Geological Survey, v. 1, 119 p.
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