Historical:Cardiff Coal Member
M. E. Hopkins and J. A. Simon
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).
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.
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.
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.
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.
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