Allenby Coal Member

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Lithostratigraphy: Kewanee Group >>Carbondale Formation >>Allenby 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


Original description

The Allenby Coal Member of the Carbondale Formation (Kosanke et al., 1960, p. 35, 48).


Named for Allenby, Saline County.

Other names

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


Type section

Type location

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.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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.




Well log characteristics


Age and correlation

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

Environments of deposition

Economic importance



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