Historical:Creal Springs 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 >>Creal Springs Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence

Authors

M. E. Hopkins and J. A. Simon

Name Origin

The Creal Springs Limestone Member of the Spoon Formation (Kosanke et al., 1960, p. 32, 64, 65) is named for Creal Springs, Williamson County.

Type Section

The type section consists of exposures in the sandstone quarry east of Creal Springs (NE SE SE 25, 10S-3E).

Correlation

In some places it was once correlated with the Curlew Limestone, but the fusulinids it contains indicate it is younger than the Curlew (Thompson et al., 1959).

Extent and Thickness

The Creal Springs is lenticular and occurs sporadically in a large part of southern Illinois.

Stratigraphic Position

In the type area the Creal Springs lies on the Granger Sandstone, but throughout much of its extent it is separated from the underlying Murphysboro Coal by several feet of gray shale.

Description

The Creal Springs Limestone is gray, argillaceous, and in places cherty. It is seldom over 2 feet thick and contains an open-marine fauna.

References

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.
THOMPSON, M. L., R. H. SHAVER, and E. A. RIGGS, 1959, Early Pennsylvanian fusulinids and ostracodes of the Illinois Basin: Journal of Paleontology, v. 33, p. 770-792; Illinois State Geological Survey Reprint 1959-P.

ISGS Codes

Stratigraphic Code Geo Unit Designation
3350
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