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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 Little Vermilion Limestone Member of the Bond Formation (Willman, ''in'' Cooper, 1945. p. 14).
Named for the Little Vermilion River in La Salle County.
The type section is exposed along Little Vermilion River (SW SW 11, 33N-1E) (Wanless, 1956, p. 12).
The Little Vermilion Limestone lies about 25 feet above the La Salle Limestone.
The Little Vermilion Limestone is as much as 4 feet thick locally.
The limestone is dark gray, argillaceous, and shaly. In the type area a coal, generally less than 1 foot thick, is found about a foot below the limestone.
It is very fossiliferous, with brachiopods (particularly ''Rhipidomella''), bryozoans, and crinoids abundant.
The Little Vermilion is tentatively correlated with the Sorento Limestone.
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COOPER, C. L., 1946, Pennsylvanian ostracodes of Illinois: Illinois State Geological Survey Bulletin 70, 177 p.<br>
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
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