Historical:Wise Ridge Coal Member
M. E. Hopkins and J. A. Simon
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.
The type section is a roadcut in Stonefort, Williamson County (NE SE 25, 10S-4E).
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.
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