Womac Coal Member
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.
M. E. Hopkins and J. A. Simon
The Womac Coal Member of the Modesto Formation (Kosanke et al., 1960, p. 38).
Named for Womac, Maccupin County.
It previously was called the Macoupin Coal (Wanless, 1931b, p. 810-811).
The type section consists of exposures in a ravine draining into Macoupin Creek 3 miles southwest of Womac (Wanless, 1956, p. 11).
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.
Well log characteristics
Age and correlation
It is correlated with the Raben Branch Coal Member in Indiana.
Environments of deposition
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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