Historical:Shoal Creek 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: McLeansboro Group >>Bond Formation >>Shoal Creek Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence

Authors

M. E. Hopkins and J. A. Simon

Name Origin

The Shoal Creek Limestone Member of the Bond Formation (Engelmann, 1868, p. 175, 177-183), the base of which is the base of the formation in all except northern Illinois, is named for Shoal Creek in Clinton County.

Type Section

The type locality consists of exposures along Shoal Creek (3N-4W).

Correlation

It is correlated with the La Salle Limestone of northern Illinois, the lower part of the Winterset Limestone Member of Missouri, and the Carthage Limestone Member of western Kentucky. The Shoal Creek Limestone Member is also recognized in Indiana.

Extent and Thickness

The limestone is commonly 6-8 feet thick, locally as much as 20 feet. It persists throughout most of the Illinois Basin and is quarried in southwestern Illinois.

Description

It is generally light gray, thick bedded, and fine grained. The Shoal Creek is an easily recognized marker on geophysical logs in most of the deeper part of the Illinois Basin. It is locally cut out by the Mt. Carmel Sandstone or the McWain Sandstone.

Fossils

It contains a diverse open-marine fauna.

References

ENGELMANN, HENRY, 1868, Geology of Clinton and Washington Counties: Geological Survey of Illinois, v. 3, p. 145-191.

ISGS Codes

Stratigraphic Code Geo Unit Designation
2110
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