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Geologic units in Christian county, Illinois

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 81 % of this area

Bond Formation

Mattoon Formation (Pennsylvanian (Kasimovian)) at surface, covers 13 % of this area

Mattoon Formation.

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 6 % of this area

Shelburn-Patoka Formations undivided.