Greenbush 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 Greenbush Coal Member of the Spoon Formation (Wanless, 1931a, p. 191).
Named for Greenbush Township, Warren County.
The type locality is in Greenbush Township (E 1/2 24, 8N-1W) (Wanless, 1956, p. 10; 1957, p. 81, 205).
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.
Well log characteristics
Age and correlation
It is correlated with the De Koven Coal of southern Illinois and western Kentucky.
Environments of deposition
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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