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Geologic units in Randolph county, Illinois

[Additional scientific data in this geographic area]

Carbondale Formation (Pennsylvanian) at surface, covers 17 % of this area
Carbondale Formation
Lithology: shale; limestone; clay or mud; sandstone; coal; black shale
Galena-Platteville Groups (Ordovician) at surface, covers 0.5 % of this area
Galena-Platteville Groups
Lithology: limestone; dolostone (dolomite); shale
Lower Chesterian (Glen Dean - Renault) Series (Mississippian) at surface, covers 29 % of this area
Lower Chersterian (Glen Dean - Renault) Series
Lithology: limestone; shale ; sandstone; coal; chert
Abbott Formation (Pennsylvanian) at surface, covers 4 % of this area
Abbott Formation
Lithology: sandstone; shale; clay or mud; coal
Modesto Formation (Pennsylvanian) at surface, covers 12 % of this area
Modesto Formation
Lithology: shale; sandstone; limestone; clay or mud; coal; black shale
Upper Chesterian (Grove Church - Tar Springs) Series (Mississippian) at surface, covers 16 % of this area
Upper Chesterian (Grove Church - Tar Springs) Series
Lithology: sandstone; shale; limestone; chert; coal
HOLOCENE SERIES (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 0.5 % of this area
HOLOCENE SERIES - Alluvium - clay, silt, sand, and gravel
Lithology: clay or mud; silt; sand; gravel
Caseyville Formation (Pennsylvanian) at surface, covers 8 % of this area
Caseyville
Lithology: sandstone; shale; coal; claystone; gravel
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
Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series (Mississippian) at surface, covers 4 % of this area
Upper Valmeyeran (Aux Vases, Ste. Genevieve, St. Louis) Series
Lithology: limestone; sandstone; dolostone (dolomite); sedimentary breccia; chert
Lower Valmeyeran (Keokuk-Sedalia) Series (Mississippian) at surface, covers 1 % of this area
Lower Valmeyeran (Keokuk-Sedalia) Series
Lithology: limestone; shale
Spoon Formation (Pennsylvanian) at surface, covers 5 % of this area
Spoon (includes Pa in northeast)
Lithology: shale; sandstone; clay or mud; limestone; coal; black shale

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