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Geologic units in Morgan county, Illinois

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 47 % of this area

Shelburn-Patoka Formations undivided.

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 42 % of this area

Carbondale Formation.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 5 % of this area

Tradewater Formation

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers 4 % of this area

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

Warsaw Formation and Salem Limestone (Mississippian (Visean)) at surface, covers 1 % of this area

Warsaw Formation and Salem Limestone in western Illinois.

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers < 0.1 % of this area

Bond Formation