Geologic units in Lawrence county, Illinois

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 63 % of this area

Bond Formation

Mattoon Formation (Pennsylvanian (Kasimovian)) at surface, covers 32 % of this area

Mattoon Formation.

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 5 % of this area

Shelburn-Patoka Formations undivided.

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

Mostly shale and sandstone; also includes thin beds of limestone and coal. WF, top of West Franklin member

Bond Formation (Pennsylvanian) at surface, covers < 0.1 % of this area

Mostly shale and sandstone; also includes thin beds of limestone and coal