Historical:Little Vermilion Limestone Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
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Lithostratigraphy: McLeansboro Group >>Bond Formation >>Little Vermilion Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence

Authors

M. E. Hopkins and J. A. Simon

Name Origin

The Little Vermilion Limestone Member of the Bond Formation (Willman, in Cooper, 1945. p. 14) is named for the Little Vermilion River in La Salle County.

Type Section

The type section is exposed along Little Vermilion River (SW SW 11, 33N-1E) (Wanless, 1956, p. 12).

Correlation

The Little Vermilion is tentatively correlated with the Sorento Limestone.

Extent and Thickness

The Little Vermilion Limestone is as much as 4 feet thick locally.

Stratigraphic Position

The Little Vermilion Limestone lies about 25 feet above the La Salle Limestone.

Description

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.

Fossils

It is very fossiliferous, with brachiopods (particularly Rhipidomella), bryozoans, and crinoids abundant.

References

COOPER, C. L., 1946, Pennsylvanian ostracodes of Illinois: Illinois State Geological Survey Bulletin 70, 177 p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
2030
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