Historical:Brush Coal Member
Lithostratigraphy: Kewanee Group >>Spoon Formation >>Brush Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Brush Coal Member of the Spoon Formation (Kosanke et al., 1960, p. 33) is named for Brush Creek, Knox County, where it is the middle of three thin coals.
Type Section
The type locality is along the creek (6, 8, 9N-2E) (Wanless, 1956, p. 9; 1957, p. 74-75).
Other Names
It previously was called the Middle De Long Coal (Wanless, 1931a, p. 188-192).
Correlation
The Brush Coal is correlated with the New Burnside Coal of southern Illinois.
Description
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.
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., 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.
ISGS Codes
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