| State | Illinois |
|---|---|
| Name | St. Louis Limestone |
| Geologic age | Mississippian (Visean) |
| Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone (Bed)Limestone can be brecciated or cherty.
Minor
Sedimentary > Carbonate > Dolostone (Bed)
Incidental
Sedimentary > Chemical > Evaporite > Anhydrite (Bed)Gypsum or anhydrite.
Sedimentary > Chemical > Evaporite > Gypsum (Bed)Gypsum or anhydrite.
|
| Comments | Thickness from stratigraphic columns: St. Louis Ls (0-500’) in southern Illinois (south of 40 degrees north latitude); St. Louis (0-100’) in northern Illinois (north of 40 degrees north latitude). In southern Illinois, unit includes "Martinsville" in lower part, and "Westfield" in upper part.[Oil well drillers' terms shown in quotation marks.] |
| Stratigraphic units | Martinsville, Westfield |
| 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 - Hancock - Hardin - Henderson - Jackson - Jersey - Johnson - McDonough - Madison - Mason - Massac - Monroe - Pike - Pope - Pulaski - Randolph - Saint Clair - Schuyler - Scott - Union |