Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone).
St. Louis Limestone.
Upper Pope Group (Tar Springs Sandstone through Kinkaid Limestone).
Ste. Genevieve Limestone.
Ullin and Salem Limestones in southern Illinois.
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.
Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone.
Shelburn-Patoka Formations undivided.
Permian ultramafic intrusions.