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Geologic units in Mason county, Illinois

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 53 % of this area

Carbondale Formation.

Warsaw Formation and Salem Limestone (Mississippian (Visean)) at surface, covers 27 % of this area

Warsaw Formation and Salem Limestone in western Illinois.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 16 % of this area

Tradewater Formation

St. Louis Limestone (Mississippian (Visean)) at surface, covers 2 % of this area

St. Louis Limestone.

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers 2 % of this area

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