Historical:Millersville Limestone Member
M. E. Hopkins and J. A. Simon
The Millersville Limestone Member of the Bond Formation (Taylor and Cady, 1944, p. 22), the top of which defines the top of the formation in central and southern Illinois, is named for Millersville, Christian County.
The type locality consists of exposures near the village (SE NE 28 and NW NW 31, 12N-1W) (Payne and Cady, 1944, p.12-13).
East of the La Salle Anticlinal Belt, the Livingston Limestone is correlated with the Millersville, as is the Argentine Limestone Member of Missouri.
Extent and Thickness
In the type area the Millersville is 50 feet thick and is divided into two or three benches by shale partings as much as 2-3 feet thick. It is the thickest limestone in the Pennsylvanian System in Illinois. In southern Fayette, Effingham, and Jasper Counties and farther south it is not well developed, although thin limestones in that area are considered as correlatives of part of the Millersville.
The limestone is light gray and fine grained. The Millersville has been extensively quarried in central Illinois.
The Millersville contains a diversified open-marine fauna.
PAYNE, J. N., and G. H. CADY, 1944, Structure of Herrin (No. 6) coal bed in Christian and Montgomery Counties and adjacent parts of Fayette. Macon, Sangamon, and Shelby Counties: Illinois State Geological Survey Circular 105, 57 p.
TAYLOR, E. F., and G. H. CADY, 1944, Structure of the Millersville Limestone in the north part of the Illinois Basin: Illinois State Geological Survey Report of Investigations 93, p. 22-26.
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