Wise Ridge Coal Member

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Lithostratigraphy: Kewanee Group >>Spoon Formation >>Wise Ridge Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian 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 Wise Ridge Coal Member of the Spoon Formation (Kosanke et al., 1960, p. 33).


Named for Wise Ridge, a hill about 3 miles west of the type section.

Other names

It previously was called the Stonefort Coal (Wanless, 1939, p. 30, 103).


Type section

Type location

The type section is a roadcut in Stonefort, Williamson County (NE SE 25, 10S-4E).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

It is commonly separated from the Stonefort Limestone (above) by 1-2 feet of black fissile shale.

Extent and thickness

The coal is lenticular but is widely present in southern Illinois. It is generally less than 3 feet thick and is very thin at some places.





Well log characteristics


Age and correlation

Environments of deposition

Economic importance



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., 1939, Pennsylvanian correlations in the Eastern Interior and Appalachian coal fields: Geological Society of America Special Paper 17, 130 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
Penn symbol.pngt-wr