Geologic notes. [Illinois]

Contents are as follows: revised correlations of the Shoal Creek and La Salle Limestone Members of the Bond Formation (Pennsylvanian) in northern Illinois; revision of nomenclature for the Springfield (No. 5) Coal Member of Illinois; the Turner Mine Shale Member: a newly named stratigraphic unit of the Carbondale Formation; stratigraphic reassignment of the Hagarstown Member in Illinois.