Eocene Series
Lithostratigraphy: Embayment Megagroup
Chronostratigraphy: Cenozoic Erathem >>Tertiary System >>Eocene Series
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 John C. Frye
Name
Original description
Eocene Series (Lyell, 1833).
Derivation
The Eocene, which means "dawn of the recent", was so named because its flora and fauna contained only a small proportion of recent species.
Other names
History/background
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Stratigraphic relationships
The Eocene sediments are all assigned to the Wilcox Formation.
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.
Lithology
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Well log characteristics
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Remarks
References
LYELL, CHARLES, 1833, Principles of geology: v. 3, London, p. 52-55, 57-58.
ISGS Codes
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