McCleary's Bluff Coal Member

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Lithostratigraphy: McLeansboro Group >>Mattoon Formation >>McClearys Bluff 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 McCleary 's Bluff Coal Member of the Mattoon Formation (Kosanke, 1950, p 89; Kosanke et al., 1960, p. 40, 51).


Named for McCleary's Bluff, Wabash County.

Other names


Type section

Type location

The type section consists of a 3-inch coal seam exposed on the bluff overlooking the Wabash River (NW SW SE 29, 2S-13W).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Its stratigraphic position is approximately 50 feet above the Friendsville Coal (Kosanke et al., 1960). It was erroneously placed below the Friendsville Coal by Kosanke (1950) and Siever (in Wanless, 1956). An unnamed coal member approximately 1 foot thick lies 7 feet above the McCleary's Bluff Coal in its type area.

Extent and thickness

The only known exposures of the McCleary's Bluff Coal occur on McCleary's Bluff and at Keys Hill in Wabash County (NE SW 25, 1S-13W).





Well log characteristics


Age and correlation

Environments of deposition

Economic importance



KOSANKE, R. M., 1950, Pennsylvanian spores of Illinois and their use in correlation: Illinois State Geological Survey Bulletin 74, 128 p.
KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.
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