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.
H. B. Willman and T. C. Buschbach
The Clement Member of the Grand Detour Formation (Templeton and Willman, 1963, p. 86).
Named for Clement Station, Ste. Genevieve County, Missouri, which is 7 miles north of the type section.
The type section of the Clement Member is located in a ravine 0.5 mile north of the village of Zell (W1/4 34, 38N-8E), where it is 13 feet thick.
Extent and thickness
The Clement Member is only 1-4 inches thick where locally present in the northern outcrop area. It is 6 feet thick in outcrops near Cape Girardeau.
The Clement consists of purplish gray, medium- to coarse-grained calcarenite. Where thick, it occurs in 2-15 inch beds that are locally cross bedded. It grades to calcarenitic limestone in some areas.
Well log characteristics
Age and correlation
Environments of deposition
TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.
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