State | Iowa |
---|---|
Name | St. Louis and Pella Formations |
Geologic age | Middle-Upper Mississippian, Meramecian-lower Chesterian |
Lithologic constituents |
Major
Sedimentary > Carbonate > Dolostone (Bed)part silty/sandy, part fossiliferous
Sedimentary > Carbonate > Limestone (Bed)part sandy to fossiliferous; part “sublithographic,” part argillaceous; incidental oolitic
Minor
Sedimentary > Clastic > Sandstone (Bed)fine to medium-grained
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed, Calcareous)shale/marl, green-gray, calcareous; incidental units, one gray, one red to pink
Sedimentary > Clastic > Sedimentary-breccia (Bed, Carbonaceous)dolomite/limestone breccia
Sedimentary > Chemical > Evaporite > Gypsum (Bed)gypsum/anhydrite (south-central Iowa)
Incidental
Sedimentary > Chemical > Chert (Bed)chert/chalcedony
|
References | Witzke, Brian J., Anderson, Raymond R., and Pope, John P., 2010, Iowa Geological and Water Survey, DNR, Bedrock Geologic Map of Iowa, OFM-2010-1. Scale 1:500,000. |
NGMDB product | |
Counties | Appanoose - Boone - Calhoun - Crawford - Dallas - Davis - Des Moines - Hamilton - Hardin - Henry - Humboldt - Ida - Iowa - Jasper - Jefferson - Keokuk - Lee - Louisa - Mahaska - Marion - Marshall - Monroe - Polk - Poweshiek - Sac - Story - Van Buren - Wapello - Washington - Webster - Wright |