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Mineral Resources > Online Spatial Data > Geology > by state > Illinois Geology

Geologic units in Saint Clair county, Illinois

Middle Valmeyeran (Salem, Warsaw, Borden, Springville; includes thin Mvl and Mk in south and east) Series (Mississippian) at surface, covers 2 % of this area

Middle Valmeyeran (Salem, Warsaw, Borden, Springville; includes thin Mvl and Mk in south and east) Series

Lithology: limestone; siltstone; shale

HOLOCENE SERIES (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.2 % of this area

HOLOCENE SERIES - Alluvium - clay, silt, sand, and gravel

Lithology: clay or mud; silt; sand; gravel

Bond Formation (Pennsylvanian) at surface, covers 0.6 % of this area

Bond Formation

Lithology: limestone; shale; sandstone; clay or mud; coal; black shale

Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series (Mississippian) at surface, covers 9 % of this area

Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series

Lithology: limestone; sandstone; dolostone (dolomite); sedimentary breccia; chert

Spoon Formation (Pennsylvanian) at surface, covers 8 % of this area

Spoon (includes Pa in northeast)

Lithology: shale; sandstone; clay or mud; limestone; coal; black shale

Lower Chesterian (Glen Dean - Renault) Series (Mississippian) at surface, covers 4 % of this area

Lower Chersterian (Glen Dean - Renault) Series

Lithology: limestone; shale ; sandstone; coal; chert

Carbondale Formation (Pennsylvanian) at surface, covers 35 % of this area

Carbondale Formation

Lithology: shale; limestone; clay or mud; sandstone; coal; black shale

Modesto Formation (Pennsylvanian) at surface, covers 34 % of this area

Modesto Formation

Lithology: shale; sandstone; limestone; clay or mud; coal; black shale

Abbott Formation (Pennsylvanian) at surface, covers 7 % of this area

Abbott Formation

Lithology: sandstone; shale; clay or mud; coal