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Geologic units in Schuyler county, Illinois

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 50 % of this area

Carbondale Formation.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 23 % of this area

Tradewater Formation

Warsaw Formation and Salem Limestone (Mississippian (Visean)) at surface, covers 15 % of this area

Warsaw Formation and Salem Limestone in western Illinois.

St. Louis Limestone (Mississippian (Visean)) at surface, covers 8 % of this area

St. Louis Limestone.

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers 3 % of this area

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

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 0.7 % of this area

Shelburn-Patoka Formations undivided.