Shumway 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 Shumway Limestone Member of the Mattoon Formation (Weller, in Dunbar and Henbest, 1942, p. 28; Wanless, 1956, p. 12).
Named for Shumway, Effingham County.
The type locality consists of exposures along Shoal Creek about 2 miles east of Shumway (SE SE SW 26, 9N-5E) (Kosanke et al., 1960, p. 81).
Extent and thickness
At the type locality it is 2 feet thick.
The Shumway is the upper, most persistent of two marine limestones. The Shumway and the thin coal a few feet under it are exposed in Effingham County. It is directly underlain by a black fissile shale and overlain by gray shale.
Well log characteristics
At the type locality it contains an abundant open-marine fauna dominated by brachiopods and containing a few solitary corals.
Age and correlation
Environments of deposition
DUNBAR, C. O., and L. G. HENBEST, 1942, Pennsylvanian Fusulinidae of Illinois: Illinois State Geological Survey Bulletin 67, 218 p.
KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
|Stratigraphic Code||Geo Unit Designation|