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  5. Illinois geologic units

Geologic units in Brown county, Illinois

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 63 % of this area

Carbondale Formation.

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

Warsaw Formation and Salem Limestone in western Illinois.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 13 % of this area

Tradewater Formation

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers 6 % of this area

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

St. Louis Limestone (Mississippian (Visean)) at surface, covers 3 % of this area

St. Louis Limestone.