Geologic units in Hamilton county, Illinois

Additional scientific data in this geographic area

Mattoon Formation (Pennsylvanian (Kasimovian)) at surface, covers 58 % of this area

Mattoon Formation.

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 42 % of this area

Bond Formation

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 0.2 % of this area

Shelburn-Patoka Formations undivided.