Brush 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 Brush Coal Member of the Spoon Formation (Kosanke et al., 1960, p. 33).
Named for Brush Creek, Knox County, where it is the middle of three thin coals.
It previously was called the Middle De Long Coal (Wanless, 1931a, p. 188-192).
The type locality is along the creek (6, 8, 9N-2E) (Wanless, 1956, p. 9; 1957, p. 74-75).
Extent and thickness
The Brush Coal, widely recognized in western Illinois, consists primarily of carbonaceous shale or bony coal only a few inches thick, which is generally overlain by the underclay of the De Long Coal and underlain by a very persistent, purplish gray underclay that is commonly 3-5 feet thick.
Well log characteristics
Age and correlation
The Brush Coal is correlated with the New Burnside Coal of southern Illinois.
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., 1931a, Pennsylvanian cycles in western Illinois: Illinois State Geological Survey Bulletin 60, p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois State Geological Survey Bulletin 82, 233 p.
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