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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.
M. E. Hopkins and J. A. Simon
The Opdyke Coal Member of the Mattoon Formation (Cady et al., 1952, p. 90-91).
Named for the village of Opdyke, Jefferson County.
The type section is in small mines in the vicinity of Belle Rive and Opdyke (3S-4E).
It lies about 430 feet above the Shoal Creek Limestone and is tentatively correlated with a 12-inch coal that crops out on the Louden Anticline in eastern Fayette County, 60-70 feet above the Millersville Limestone.
In the type locality the Opdyke is fairly extensive and as much as 2 feet thick locally. It crops out in eastern and southeastern Jefferson County and northwestern Hamilton County. It is believed to be extensive in the subsurface of central Illinois.
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CADY, G. H., et al., 1952, Minable coal reserves of Illinois: Illinois State Geological Survey Bulletin 78, 138 p.
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