Historical:Clermont Shale Member

	Handbook of Illinois Stratigraphy
Series	Bulletin 95
Author	H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date	1975
Link	Web page
PDF	PDF file
Store	ISGS Store

	Handbook of Illinois Stratigraphy
Series	Bulletin 95
Author	H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date	1975
Link	Web page
PDF	PDF file
Store	ISGS Store

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Lithostratigraphy: Maquoketa Shale Group >>Scales Shale >>Clermont Shale Member
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Cincinnatian Series >>Maysvillian Stage
Allostratigraphy: Tippecanoe Sequence

Authors

H. B. Willman and T. C. Buschbach

Name Origin

The Clermont Shale Member of the Scales Shale (Calvin, 1906, p. 60, 98), the upper member, is named for Clermont, Fayette County, Iowa.

Extent and Thickness

The Clermont Member is generally 15-20 feet thick but thickens in central and southeastern Illinois.

Description

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.

References

CALVIN, SAMUEL, 1906, Geology of Winneshiek County: Iowa Geological Survey, v. 16, p. 37-146.

ISGS Codes

Stratigraphic Code	Geo Unit Designation
7450	--