Historical:Stonefort Limestone Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: Kewanee Group >>Spoon Formation >>Stonefort Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence


M. E. Hopkins and J. A. Simon

Name Origin

The Stonefort Limestone Member of the Spoon Formation (Henbest, 1928, p. 70-71) is named for Stonefort, Williamson County.

Type Section

The type locality consists of a roadcut and near-by ravines (NE SE 25, 10S- 4E), a correction of the location given by Wanless (1956, p. 9) (Kosanke et al., 1960, p. 33).

Extent and Thickness

It is seldom over 3 feet thick, and extends throughout the greater part of southern Illinois. It has been identified on geophysical logs of oil tests in much of the southern part of the Illinois Basin.


The Stonefort is a gray, fine-grained, marine limestone.


HENBEST, L. G., 1928, Fusulinellas from the Stonefort Limestone Member of the Tradewater Formation: Journal of Paleontology, v. 2, p. 70-85.
KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation