Opdyke Coal Member

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Lithostratigraphy: McLeansboro Group >>Mattoon Formation >>Opdyke Coal 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


Original description

The Opdyke Coal Member of the Mattoon Formation (Cady et al., 1952, p. 90-91).


Named for the village of Opdyke, Jefferson County.

Other names


Type section

Type location

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

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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.

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.





Well log characteristics


Age and correlation

Environments of deposition

Economic importance



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