Historical:De Graff Coal Member

	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
Link	Web page
PDF	PDF file
Store	ISGS Store

	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
Link	Web page
PDF	PDF file
Store	ISGS Store

Lithostratigraphy: McLeansboro Group >>Modesto Formation >>De Graff Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence

Authors

M. E. Hopkins and J. A. Simon

Name Origin

The De Graff Coal Member of the Modesto Formation (Cady, in Kosanke et al., 1960, p. 37) is named for De Graff School, Perry County.

Type Section

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

Other Names

It previously was informally called the First Cutler Rider coal.

Description

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

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	--