Geologic units in Sullivan county, Indiana

Patoka and Shelburn Formations (Pennsylvanian) at surface, covers 62 % of this area

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

Carbondale Group (Pennsylvanian) at surface, covers 19 % of this area

Mostly shale and sandstone; also includes thin beds of limestone, clay, and coal. S, Springfield Coal Member

Bond Formation (Pennsylvanian) at surface, covers 17 % of this area

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

Mattoon Formation (Pennsylvanian) at surface, covers 1 % of this area

Mostly shale and sandstone; also includes thin beds of coal

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 0.3 % of this area

Shelburn-Patoka Formations undivided.