| State | Illinois |
|---|---|
| Name | Ste. Genevieve Limestone |
| Geologic age | Mississippian (Visean) |
| Lithologic constituents |
Major
Sedimentary > Carbonate > Limestone (Bed)Limestone can be oolitic, shaly or sandy.
Minor
Sedimentary > Clastic > Sandstone (Bed)Sandstone can be shaly or argillaceous.
|
| Comments | Thickness from stratigraphic columns: Ste. Genevieve Ls (0-400’) in southern Illinois (south of 40 degrees north latitude); Ste. Genevieve Ls (0-80’) in northern Illinois (north of 40 degrees north latitude). Ste. Genevieve Limestone includes, from oldest to youngest, Fredonia Ls Mbr - “McClosky”, Spar Mountain Ss Mbr - “Rosiclare” Ss Mbr, Karnak Ls Mbr - “Ohara”, and “Aux Vases lime” in southern Illinois. The Ste. Genevieve Limestone is the uppermost formation of the Mammoth Cave Group. [The 'Mbr' designators were derived from Geolex IL005 reference.][Oil well drillers' terms shown in quotation marks.] |
| Stratigraphic units | Fredonia Ls Mbr - “McClosky”, Spar Mountain Ss Mbr - “Rosiclare” Ss Mbr, Karnak Ls Mbr - “Ohara”, “Aux Vases lime” |
| References | Kolata, D.R., comp., 2005, Bedrock Geology of Illinois: Champaign, Ill., Illinois State Geological Survey, Illinois Map Series 14, scale 1:500,000.USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/https://ngmdb.usgs.gov/Geolex/search |
| NGMDB product | |
| Counties | Hardin - Johnson - Madison - Massac - Monroe - Pope - Pulaski - Randolph - Saint Clair - Union |