Shoal Creek Limestone Member

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

M. E. Hopkins and J. A. Simon

Name

Original description

The Shoal Creek Limestone Member of the Bond Formation (Engelmann, 1868, p. 175, 177-183).

Derivation

Named for Shoal Creek in Clinton County.

Other names

History/background

Type section

Type location

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

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The base of the Shoal Creek Limestone Member is the base of the Bond Formation in all except northern Illinois.

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.

Lithology

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.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

It contains a diverse open-marine fauna.

Age and 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.

Environments of deposition

Economic importance

Remarks

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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