Historical:Opdyke Coal 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 >>Opdyke Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence


M. E. Hopkins and J. A. Simon

Name Origin

The Opdyke Coal Member of the Mattoon Formation (Cady et al., 1952, p. 90-91) is named for the village of Opdyke, Jefferson County.

Type Section

The type section is in small mines in the vicinity of Belle Rive and Opdyke (3S-4E).

Extent and Thickness

In the type locality the Opdyke is fairly extensive and as much as 2 feet thick locally. It crops out in eastern and southeastern Jefferson County and northwestern Hamilton County. It is believed to be extensive in the subsurface of central Illinois.

Stratigraphic Position

It lies about 430 feet above the Shoal Creek Limestone and is tentatively correlated with a 12-inch coal that crops out on the Louden Anticline in eastern Fayette County, 60-70 feet above the Millersville Limestone.


CADY, G. H., et al., 1952, Minable coal reserves of Illinois: Illinois State Geological Survey Bulletin 78, 138 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation