| State | Illinois |
|---|---|
| Name | Warsaw Formation and Salem Limestone |
| Geologic age | Mississippian (Visean) |
| Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone (Bed)Limestone can be shaly, oolitic, bioclastic, or cherty.
Minor
Sedimentary > Carbonate > Dolostone (Bed)
Sedimentary > Clastic > Siltstone (Bed, Calcareous)Siltstone can contain geodes or drusy quartz and can be calcareous.
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)Shale can be calcareous.
|
| Comments | Thickness from stratigraphic columns, from oldest to youngest: Warsaw Fm (0-100’) and Salem Ls (0-500’) in southern Illinois (south of 40 degrees north latitude); Warsaw Fm (0-100’), and Salem Fm (0-40’) and the equivalent Sonora Fm (0-20') in northern Illinois (north of 40 degrees north latitude). Both the Warsaw and Salem Fms are part of the Mammoth Cave Group. The Warsaw in southern Illinois is laterally equivalent to the Ullin Ls and the upper part of both the Borden Sltst and Ft. Payne Fm; the Warsaw in northern Illinois is laterally equivalent to the upper part of the Borden Sltst. |
| Stratigraphic units | Sonora Formation |
| 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 - Brown - Calhoun - Cass - Fulton - Greene - Hancock - Henderson - Jackson - Jersey - McDonough - Madison - Mason - Monroe - Morgan - Pike - Randolph - Saint Clair - Schuyler - Scott - Union |