Historical:Stonefort Limestone Member
Lithostratigraphy: Kewanee Group >>Spoon Formation >>Stonefort Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Stonefort Limestone Member of the Spoon Formation (Henbest, 1928, p. 70-71) is named for Stonefort, Williamson County.
Type Section
The type locality consists of a roadcut and near-by ravines (NE SE 25, 10S- 4E), a correction of the location given by Wanless (1956, p. 9) (Kosanke et al., 1960, p. 33).
Extent and Thickness
It is seldom over 3 feet thick, and extends throughout the greater part of southern Illinois. It has been identified on geophysical logs of oil tests in much of the southern part of the Illinois Basin.
Description
The Stonefort is a gray, fine-grained, marine limestone.
References
HENBEST, L. G., 1928, Fusulinellas from the Stonefort Limestone Member of the Tradewater Formation: Journal of Paleontology, v. 2, p. 70-85.
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.
ISGS Codes
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