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Geologic units in Cass county, Illinois

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 52 % of this area

Carbondale Formation.

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers 26 % of this area

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 11 % of this area

Tradewater Formation

Warsaw Formation and Salem Limestone (Mississippian (Visean)) at surface, covers 7 % of this area

Warsaw Formation and Salem Limestone in western Illinois.

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 4 % of this area

Shelburn-Patoka Formations undivided.

St. Louis Limestone (Mississippian (Visean)) at surface, covers 0.2 % of this area

St. Louis Limestone.