Historical:Greenup Limestone Member
M. E. Hopkins and J. A. Simon
The Greenup Limestone Member of the Mattoon Formation (Newton and Weller, 1937, p. 9, 26), the youngest named member of the formation, is 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).
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.
The open-marine fauna of the Greenup is dominated by brachiopods and crinoids but also includes a few corals and locally abundant fusulinids.
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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