Bunje Limestone Member

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Lithostratigraphy: McLeansboro Group >>Bond Formation >>Bunje 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 Bunje Limestone Member of the Bond Formation (Simon, in Kosanke et al., 1960, p. 39).

Derivation

Named for Bunje Station, Bond County.

Other names

History/background

Type section

Type location

The type section is about 1 mile south of Bunje Station, along Dry Fork (SE SW 7, 6N-4W).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

It is underlain by an unnamed sandstone unit and is commonly about 40 feet above the Sorento Limestone. The Bunje is separated from the Flat Creek Coal above by a few feet of shale and underclay.

Extent and thickness

The Bunje is known only in the type locality, where it is generally less than 2 feet thick.

Lithology

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

It is very fossiliferous, having a fauna dominated by large pelecypods, and the upper few inches is characterized by cone-in-cone structure.

Age and correlation

Environments of deposition

Economic importance

Remarks

References

KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
2010
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