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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.
H. B. Willman and John C. Frye
Eocene Series (Lyell, 1833).
The Eocene, which means "dawn of the recent", was so named because its flora and fauna contained only a small proportion of recent species.
The Eocene sediments are all assigned to the Wilcox Formation.
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.
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LYELL, CHARLES, 1833, Principles of geology: v. 3, London, p. 52-55, 57-58.
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