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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.
Elwood Atherton, Charles Collinson, and Jerry A. Lineback
The Cora Limestone Member of the Clore Formation (Swann, 1963, p. 40-41).
Named for Cora, Jackson County.
The type section of the Cora Limestone Member is at the mouth of Degonia Creek Hollow (SW SE 16, 8S-5W).
The Cora Limestone Member is the lowest member of the Clore Formation.
The Cora is 15-45 feet thick.
It varies from dominantly limestone to dominantly shale. In both facies, the Cora is interbedded limestone and shale and locally contains sandstone lenses.
A zone in the Cora Member in which the limestone surfaces are covered with delicate branching bryozoans is the ''Batostomella nitidula'' Peak Zone (S. Weller, 1926).
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SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p. <br>
WELLER, STUART, 1926, Faunal zones in the standard Mississippian section: Journal of Geology, v. 34, p. 320-335.
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