Hermon Coal Member of Tradewater Formation of Raccoon Creek Group (IL-local)
Middle Pennsylvanian (earliest Desmoinesian)
Type locality: along Brush Creek, in secs. 6 and 8, T. 9 N., R. 2 E., Knox Co., western IL. Named from village of Hermon about 2.5 mi south of type outcrop (Kosanke and others, 1960).
Illinois basin
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