Geologic units in Saline county, Illinois

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 51 % of this area

Shelburn-Patoka Formations undivided.

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 20 % of this area

Carbondale Formation.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 16 % of this area

Tradewater Formation

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 11 % of this area

Bond Formation

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

Caseyville Formation

Upper Pope Group (Tar Springs Sandstone through Kinkaid Limestone) (Mississippian (Serpukhovian)) at surface, covers 0.8 % of this area

Upper Pope Group (Tar Springs Sandstone through Kinkaid Limestone).

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone) (Mississippian (Visean)) at surface, covers 0.1 % of this area

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone).

New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone (Middle Devonian (Givetian) to Upper Devonian (Fammenian)) at surface, covers < 0.1 % of this area

New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone.