Stonefort 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 Stonefort Limestone Member of the Spoon Formation (Henbest, 1928, p. 70-71).
Named for Stonefort, Williamson County.
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.
The Stonefort is a gray, fine-grained, marine limestone.
Well log characteristics
Age and correlation
Environments of deposition
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.
|Stratigraphic Code||Geo Unit Designation|