Geologic units in Jasper county, Illinois

Mattoon Formation (Pennsylvanian (Kasimovian)) at surface, covers 96 % of this area

Mattoon Formation.

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 4 % of this area

Bond Formation

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers < 0.1 % of this area

Shelburn-Patoka Formations undivided.