Historical:Cardiff Coal Member
Lithostratigraphy: Kewanee Group >>Carbondale Formation >>Cardiff coal bed
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Cardiff Coal Member of the Carbondale Formation (Cady, 1915) is named for Cardiff, Livingston County. The name was not in general use until re-introduced by Peppers (1970).
Type Section
The type locality is in mines at Cardiff (22, 23, 30N-8E).
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.
Stratigraphic Position
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.
Description
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.
References
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
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