Historical:Effingham 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 >>Mattoon Formation >>Effingham Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Virgilian Series
Allostratigraphy: Absaroka Sequence

Authors

M. E. Hopkins and J. A. Simon

Name Origin

The Effingham Limestone Member of the Mattoon Formation (Wanless, 1956, p. 7, 12) is named for Effingham, Effingham County.

Type Section

The type section consists of outcrops in the east-flowing tributary to Salt Creek just south of Effingham (S line NW 33, 8N-6E).

Extent and Thickness

This limestone has not been recognized far from the type area.

Description

It is a 1-foot bed of granular conglomeratic limestone containing numerous brachiopods, gastropods, crinoids, and a few corals. A thin, black fissile shale occurs about 3 feet above the Effingham Limestone.

References

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
1680
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