H. B. Willman and T. C. Buschbach
The Clement Member of the Grand Detour Formation (Templeton and Willman, 1963, p. 86) is 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.
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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