| State | Illinois |
|---|---|
| Name | Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone |
| Geologic age | Mississippian (Tourniaisian to Visean) |
| Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone (Bed)Limestone can be shaly or argillaceous, cherty, or bioclastic.
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)
|
| Comments | Thickness from stratigraphic columns (listed from oldest to youngest): Meppen Ls (0-20’), Fern Glen Fm (0-100’) and Burlington-Keokuk Ls (0-420’) in southern Illinois (south of 40 degrees north latitude); Burlington-Keokuk Ls (0-200’) in northern Illinois (north of 40 degrees north latitude). These three units are part of the Mammoth Cave Group, based on the stratigraphic columns. |
| References | Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000. |
| NGMDB product | |
| Counties | Adams - Alexander - Brown - Calhoun - Cass - Douglas - Greene - Hancock - Hardin - Henderson - Jersey - Knox - McDonough - Madison - Mason - Monroe - Morgan - Pike - Randolph - Schuyler - Scott - Union - Warren |