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Historical:Eocene Series

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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
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Lithostratigraphy: Embayment Megagroup
Chronostratigraphy: Cenozoic Erathem >>Tertiary System >>Eocene Series

Authors

H. B. Willman and John C. Frye

Name Origin

The Eocene, which means "dawn of the recent," was so named because its flora and fauna contained only a small proportion of recent species.

Extent and Thickness

The Eocene Series (Lyell, 1833) in Illinois occurs in a small area in Pulaski and Alexander Counties. It is exposed only in Pulaski County in the hills from Mounds west to Cache Valley. The Eocene sediments are all assigned to the Wilcox Formation.

References

LYELL, CHARLES, 1833, Principles of geology: v. 3, London, p. 52-55, 57-58.

ISGS Codes

Stratigraphic Code Geo Unit Designation
1240
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