Little Vermilion Limestone Member

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Lithostratigraphy: McLeansboro Group >>Bond Formation >>Little Vermilion Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian Series
Allostratigraphy: Absaroka Sequence

Primary source

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.

Contributing author(s)

M. E. Hopkins and J. A. Simon

Name

Original description

The Little Vermilion Limestone Member of the Bond Formation (Willman, in Cooper, 1945. p. 14).

Derivation

Named for the Little Vermilion River in La Salle County.

Other names

History/background

Type section

Type location

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

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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

Extent and thickness

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

Lithology

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.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

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

Age and correlation

The Little Vermilion is tentatively correlated with the Sorento Limestone.

Environments of deposition

Economic importance

Remarks

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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