De Graff Coal Member
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
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