Historical:Womac Coal Member
Lithostratigraphy: McLeansboro Group >>Modesto Formation >>Womac Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence
M. E. Hopkins and J. A. Simon
The Womac Coal Member of the Modesto Formation (Kosanke et al., 1960, p. 38) is named for Womac, Maccupin County.
The type section consists of exposures in a ravine draining into Macoupin Creek 3 miles southwest of Womac (Wanless, 1956, p. 11).
It previously was called the Macoupin Coal (Wanless, 1931b, p. 810-811).
It is correlated with the Raben Branch Coal Member in Indiana.
Extent and Thickness
This thin coal is widely traced in the Illinois Basin along with the overlying Macoupin Limestone, from which it is separated 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., 1931b, Pennsylvanian section in western Illinois: Geological Society of America Bulletin, v. 42, p. 801-812.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
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