Geologic units in Randolph county, Illinois

Geologic units in Randolph county, Illinois

Additional scientific data in this geographic area

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone) (Mississippian (Visean)) at surface, covers 28 % of this area

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

Upper Pope Group (Tar Springs Sandstone through Kinkaid Limestone) (Mississippian (Serpukhovian)) at surface, covers 17 % of this area

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

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 17 % of this area

Shelburn-Patoka Formations undivided.

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 12 % of this area

Carbondale Formation.

Caseyville Formation (Pennsylvanian (Bashkirian)) at surface, covers 9 % of this area

Caseyville Formation

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 8 % of this area

Tradewater Formation

St. Louis Limestone (Mississippian (Visean)) at surface, covers 4 % of this area

St. Louis Limestone.

Warsaw Formation and Salem Limestone (Mississippian (Visean)) at surface, covers 2 % of this area

Warsaw Formation and Salem Limestone in western Illinois.

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone (Mississippian (Tourniaisian to Visean)) at surface, covers 1 % of this area

Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone.

Holocene series (Quaternary-Holocene Series) at surface, covers 0.5 % of this area

Alluvium - clay, silt, sand, and gravel.

Kimmswick (Trenton) Limestone and Decorah Formation (Upper Ordovician (Stage 6)) at surface, covers 0.5 % of this area

Kimmswick (Trenton) Limestone and Decorah Formation in southern and western Illinois.

Ste. Genevieve Limestone (Mississippian (Visean)) at surface, covers < 0.1 % of this area

Ste. Genevieve Limestone.