Cardiff coal bed

Revision as of 18:03, 12 February 2021 by IlLex (talk | contribs) (IlLex moved page Cardiff Coal Member to Cardiff coal bed over redirect)
Jump to navigation Jump to search

Lithostratigraphy: Kewanee Group >>Carbondale Formation >>Cardiff 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 Cardiff Coal Member of the Carbondale Formation (Cady, 1915). The name was not in general use until re-introduced by Peppers (1970).


Named for Cardiff, Livingston County.

Other names


Type section

Type location

The type locality is in mines at Cardiff (22, 23, 30N-8E).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

It generally is not more than 10 feet above the Colchester (No. 2) Coal. At a few localities the Cardiff directly overlies the Colchester Coal.

Extent and thickness

The Cardiff Coal is known only in northeastern Livingston, southeastern Grundy, and western Kankakee Counties, where it occurs in channels trending northeast-southwest eroded in gray shale. The Cardiff Coal is highly lenticular and was reported in one mine to be 12 feet thick.


It commonly is in more than one major bench, the benches separated by gray shale. Peppers (1970) described the flora and concluded that the Cardiff Coal is a little older than the Lowell Coal.




Well log characteristics


Age and correlation

Environments of deposition

Economic importance



CADY, G. H., 1915, Coal resources of District I (Longwall): Illinois State Geological Survey Mining Investigations Bulletin 10, 149 p.
PEPPERS, R. A., 1970, Correlation and palynology of coals in the Carbondale and Spoon Formations (Pennsylvanian) of the northeastern part of the Illinois Basin: Illinois State Geological Survey Bulletin 93, 173 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation