Historical:Wise Ridge Coal Member
Lithostratigraphy: Kewanee Group >>Spoon Formation >>Wise Ridge Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence
Authors
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.
Description
It is commonly separated from the Stonefort Limestone (above) by 1-2 feet of black fissile shale.
References
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
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