Millersville Limestone 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 Millersville Limestone Member of the Bond Formation (Taylor and Cady, 1944, p. 22).
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).
The the top of the Millersville Limestone Member defines the top of the Bond Formation in central and southern Illinois.
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.
Well log characteristics
The Millersville contains a diversified open-marine fauna.
Age and correlation
East of the La Salle Anticlinal Belt, the Livingston Limestone is correlated with the Millersville, as is the Argentine Limestone Member of Missouri.
Environments of deposition
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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