Historical:Allenby 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 >>Allenby Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence


M. E. Hopkins and J. A. Simon

Name Origin

The Allenby Coal Member of the Carbondale Formation (Kosanke et al., 1960, p. 35, 48) is named for Allenby, Saline County.

Type Section

The type locality is in Williamson County, half a mile northeast of the village along the roadside east of a railroad crossing (NE NW 24, 9S-4E) (Kosanke, 1950, p. 79), where it occurs 1-2 feet above the Bankston Fork Limestone.

Other Names

It was formerly called the Bankston Coal (Wanless, 1939, p. 14, 76).


It is minable locally in western Kentucky, where it is called the Baker coal.

Extent and Thickness

It is a thin coaly zone occurring in much of Williamson, Saline, and Gallatin Counties.


It is generally overlain by a greenish gray or gray shale and is underlain by underclay.


KOSANKE, R. M., 1950, Pennsylvanian spores of Illinois and their use in correlation: Illinois State Geological Survey Bulletin 74, 128 p.
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.
WANLESS, H. R., 1939, Pennsylvanian correlations in the Eastern Interior and Appalachian coal fields: Geological Society of America Special Paper 17, 130 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation