Greenup 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 Greenup Limestone Member of the Mattoon Formation (Newton and Weller, 1937, p. 9, 26).
Named for Greenup, Cumberland County.
The type section consists of exposures along the valley wall of the Embarras River just west of Greenup (cen. W 1/2 NE 3, 9N-9E) (Kosanke et al., 1960, p. 41, 51, 79).
The Greenup Limestone Member is the youngest named member of the Mattoon Formation.
Extent and thickness
The Greenup is known from several outcrops in the northern part of the area of the Mattoon Formation in Jasper, Cumberland, and Coles Counties, where it is as much as 8 feet thick and has been quarried locally.
The Greenup is a relatively pure limestone with an abundant open-marine fauna.
Well log characteristics
The open-marine fauna of the Greenup is dominated by brachiopods and crinoids but also includes a few corals and locally abundant fusulinids.
Age and correlation
Environments of deposition
It represents a major marine transgression into Illinois.
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.
NEWTON, W. A., and J. M. WELLER, 1937, Stratigraphic studies of Pennsylvanian outcrops in part of southeastern Illinois: Illinois State Geological Survey Report of Investigations 45, 31 p.
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