Historical:Greenbush Coal Member
Lithostratigraphy: Kewanee Group >>Spoon Formation >>Greenbush Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Greenbush Coal Member of the Spoon Formation (Wanless, 1931a, p. 191) is named for Greenbush Township, Warren County.
Type Section
The type locality is in Greenbush Township (E 1/2 24, 8N-1W) (Wanless, 1956, p. 10; 1957, p. 81, 205).
Correlation
It is correlated with the De Koven Coal of southern Illinois and western Kentucky.
Extent and Thickness
The Greenbush Coal is seldom more than a few inches thick, and it grades into a thin carbonaceous shale in some localities.
References
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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