Geologic units in Franklin county, Illinois

Additional scientific data in this geographic area

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 66 % of this area

Bond Formation

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 32 % of this area

Shelburn-Patoka Formations undivided.

Mattoon Formation (Pennsylvanian (Kasimovian)) at surface, covers 2 % of this area

Mattoon Formation.