Historical:Effingham Limestone Member
M. E. Hopkins and J. A. Simon
The Effingham Limestone Member of the Mattoon Formation (Wanless, 1956, p. 7, 12) is named for Effingham, Effingham County.
The type section consists of outcrops in the east-flowing tributary to Salt Creek just south of Effingham (S line NW 33, 8N-6E).
Extent and Thickness
This limestone has not been recognized far from the type area.
It is a 1-foot bed of granular conglomeratic limestone containing numerous brachiopods, gastropods, crinoids, and a few corals. A thin, black fissile shale occurs about 3 feet above the Effingham Limestone.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
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