Historical:Summum Coal Member

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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
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Lithostratigraphy: Kewanee Group >>Carbondale Formation >>Summum Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence


M. E. Hopkins and J. A. Simon

Name Origin

The Summum (No. 4) Coal Member of the Carbondale Formation (Wanless, 1931a, p. 182, 192) is named for Summum, Fulton County. The term "No. 4" was first used by Lesquereux (1866, p. 213) for this coal near Shawneetown, Gallatin County. It was also applied incorrectly by Worthen (1870) to the Springfield (No. 5) Coal in parts of Fulton County.

Type Section

Summum is near the type locality (NE 3, 3N-2E) (Wanless, 1956, p. 10; 1957, p. 204).


It is correlated with the Mulky coal of Missouri and Kansas, the Houchin Creek Coal Member (IVa) in Indiana, and the No. 8b coal in western Kentucky.

Extent and Thickness

The coal, or the recognized position of the coal, is one of the most widespread stratigraphic markers in the state, but it is generally thin.

Stratigraphic Position

It normally is overlain by the black Excello Shale and overlies an underclay.


The Summum Coal Member has been mined only locally in Grundy, Kankakee, Fulton, and Saline Counties.


LESQUEREUX, LEO, 1866, Report on the coal fields of Illinois: Geological Survey of Illinois, v. 1, p. 208-237.
WANLESS, H. R., 1931a, Pennsylvanian cycles in western Illinois: Illinois State Geological Survey Bulletin 60, p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois State Geological Survey Bulletin 82, 233 p.
WORTHEN, A. H., 1870, Geology and paleontology: Geological Survey of Illinois, v. 4, 508 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation