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Geologic units in Madison county, Illinois

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 52 % of this area

Shelburn-Patoka Formations undivided.

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 18 % of this area

Bond Formation

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 12 % of this area

Carbondale Formation.

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone) (Mississippian (Visean)) at surface, covers 5 % of this area

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone).

Ste. Genevieve Limestone (Mississippian (Visean)) at surface, covers 4 % of this area

Ste. Genevieve Limestone.

St. Louis Limestone (Mississippian (Visean)) at surface, covers 4 % of this area

St. Louis Limestone.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 3 % of this area

Tradewater Formation

Warsaw Formation and Salem Limestone (Mississippian (Visean)) at surface, covers 1.0 % of this area

Warsaw Formation and Salem Limestone in western Illinois.

Holocene series (Quaternary-Holocene Series) at surface, covers < 0.1 % of this area

Alluvium - clay, silt, sand, and gravel.

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers < 0.1 % of this area

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