Reynoldsburg Coal Member

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Lithostratigraphy: McCormick Group >>Abbott Formation >>Reynoldsburg Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Atokan 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 Reynoldsburg Coal Member of the Abbott Formation (Weller, 1940, p. 39).


Named for Reynoldsburg, Johnson County.

Other names


Type section

Type location

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

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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

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.


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.




Well log characteristics


Age and correlation

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.

Environments of deposition

Economic importance



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