Historical:Wise Ridge Coal Member

Jump to navigation Jump to search
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
Link Web page
PDF PDF file
Store ISGS Store

Lithostratigraphy: Kewanee Group >>Spoon Formation >>Wise Ridge Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence


M. E. Hopkins and J. A. Simon

Name Origin

The Wise Ridge Coal Member of the Spoon Formation (Kosanke et al., 1960, p. 33) is named for Wise Ridge, a hill about 3 miles west of the type section.

Type Section

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

Other Names

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

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.


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


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