Clermont Shale Member
Lithostratigraphy: Maquoketa Shale Group >>Scales Shale >>Clermont Shale Member
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Cincinnatian Series >>Maysvillian Stage
Allostratigraphy: Tippecanoe Sequence
Primary source
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.
Contributing author(s)
H. B. Willman and T. C. Buschbach
Name
Original description
The Clermont Shale Member of the Scales Shale (Calvin, 1906, p. 60, 98).
Derivation
Named for Clermont, Fayette County, Iowa.
Other names
History/background
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Stratigraphic relationships
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.
Lithology
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.
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Remarks
References
CALVIN, SAMUEL, 1906, Geology of Winneshiek County: Iowa Geological Survey, v. 16, p. 37-146.
ISGS Codes
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