Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone).
St. Louis Limestone.
Caseyville Formation
Upper Pope Group (Tar Springs Sandstone through Kinkaid Limestone).
Ste. Genevieve Limestone.
Ullin and Salem Limestones in southern Illinois.
Tradewater Formation
Ft. Payne Formation, includes Springville Shale and Chouteau Limestone in southern Illinois.
New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone.
Carbondale Formation.
Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone.
Shelburn-Patoka Formations undivided.
Permian ultramafic intrusions.