Clermont Shale Member

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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

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

Type section

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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

Stratigraphic Code Geo Unit Designation
7450
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