Historical:Reynoldsburg 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: McCormick Group >>Abbott Formation >>Reynoldsburg Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Atokan Series
Allostratigraphy: Absaroka Sequence


M. E. Hopkins and J. A. Simon

Name Origin

The Reynoldsburg Coal Member of the Abbott Formation (Weller, 1940, p. 39) is named for Reynoldsburg, Johnson County.

Type Section

The type locality is north of Cedar Creek, Johnson County, Illinois (W 1/2 32, 11S-4E).


No coal at this position has been identified in western Illinois, but the No. 2 coal in western Kentucky is thought to be equivalent to the Reynoldsburg.

Extent and Thickness

The Reynoldsburg is well known only in a relatively small area in the central part of the southern Illinois outcrop belt, where the thickness of the coal is very irregular but is as much as 3 feet.

Stratigraphic Position

The Reynoldsburg Coal Member is the lowermost named member in southern Illinois.


The Reynoldsburg varies in character, apparently grading to a canneloid black shale near the type locality. The Reynoldsburg Coal has been mined locally in the type area. It is well exposed along Interstate 24 in the northernmost of a series of large highway cuts, which exposes all the Caseyville Formation and the lowermost part of the Abbott Formation.


WELLER, J. M., 1940, Geology and oil possibilities of extreme southern Illinois: Illinois State Geological Survey Report of Investigations 71, 71 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation