De Graff Coal Member

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Lithostratigraphy: McLeansboro Group >>Modesto Formation >>De Graff Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian 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 De Graff Coal Member of the Modesto Formation (Cady, in Kosanke et al., 1960, p. 37).

Derivation

Named for De Graff School, Perry County.

Other names

It previously was informally called the First Cutler Rider coal.

History/background

Type section

Type location

The type section consists of exposures along Galum Creek, near De Graff School (SE cor. NE SW 21, 5S-4W).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Extent and thickness

Lithology

This thin, lenticular coal occurs a few feet above the Piasa Limestone in southern Illinois.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

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
2430
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