Historical:Pokeberry Limestone Member
M. E. Hopkins and J. A. Simon
The Pokeberry Limestone Member of the Carbondale Formation (Wanless, 1939, p. 17, 98) is named for Pokeberry School, Schuyler County.
Pokeberry School is near the type locality (NW 26, 2N-1W) (Wanless, 1956, p. 11; 1957, p. 113, 188).
It was correlated by Wanless (1957, p. 113) with the Conant Limestone, but its position and correlation are uncertain. It may correlate with the Bankston Fork Limestone.
Extent and Thickness
The limestone is known only in the type area.
Where it is found, it is 15 feet above the Herrin Coal and 9 feet below the Danville (No. 7) Coal.
It is a gray, dense, locally conglomeratic or brecciated limestone containing large fossils, most of them brachiopods. It has a very knobby upper surface. The Pokeberry Limestone is not shown on the geologic column (fig. P-2).
WANLESS, H. R., 1939, Pennsylvanian correlations in the Eastern Interior and Appalachian coal fields: Geological Society of America Special Paper 17, 130 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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