Clermont Shale 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.
H. B. Willman and T. C. Buschbach
The Clermont Shale Member of the Scales Shale (Calvin, 1906, p. 60, 98).
Named for Clermont, Fayette County, Iowa.
The Clermont Shale Member is the upper member of the Scales Shale.
Extent and thickness
The Clermont Member is generally 15-20 feet thick but thickens in central and southeastern Illinois.
The Clermont Member is dominantly gray shale overlying the zone of interbedded shale and limestone in the upper part of the Elgin Shale Member. Where that zone cannot be distinguished, which is commonly the case in subsurface, it is not differentiated.
Well log characteristics
Age and correlation
Environments of deposition
CALVIN, SAMUEL, 1906, Geology of Winneshiek County: Iowa Geological Survey, v. 16, p. 37-146.
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