# List of fossiliferous stratigraphic units in Iowa

This article contains a list of fossil-bearing stratigraphic units in the state of Iowa, U.S.

## Sites

| Group or Formation | Period |
| Altamont Formation | Carboniferous |
| Blanding Formation | Silurian |
| Brainard Formation | Ordovician |
| Bronson Group/Dennis Formation | Carboniferous |
| Burlington Limestone | Carboniferous |
| Cedar Valley Group/Coralville Formation | Devonian |
| Cedar Valley Group/Linwood Formation | Devonian |
| Cedar Valley Group/Lithograph City Formation | Devonian |
| Cedar Valley Group/Little Cedar Formation | Devonian |
| Cedar Valley Group/Shell Rock Formation | Devonian |
| Chapin Formation | Carboniferous |
| Cherokee Group | Carboniferous |
| Coralville Formation | Devonian |
| Dakota Formation | Cretaceous |
| Decorah Shale | Ordovician |
| Dennis Formation | Carboniferous |
| Dewey Formation | Carboniferous |
| Dunleith Formation | Ordovician |
| English River Formation | Carboniferous |
| Galena Dolomite | Ordovician |
| Galena Group/Cummingsville Formation | Ordovician |
| Galena Group/Decorah shale | Ordovician |
| Galena Group/Dubuque Formation | Ordovician |
| Galena Group/Dunleith Formation | Ordovician |
| Galena Group/Guttenberg Formation | Ordovician |
| Galena Group/Ion Formation | Ordovician |
| Galena Group/Spechts Ferry Formation | Ordovician |
| Galena Group/Wise Lake Formation | Ordovician |
| Gilmore City Limestone | Carboniferous |
| Glenwood Formation | Ordovician |
| Gower Formation | Silurian |
| Grand Detour Formation | Ordovician |
| Graneros Shale | Cretaceous |
| Guttenberg Formation | Ordovician |
| Hackberry Group/Lime Creek Formation | Devonian |
| Hampton Formation | Carboniferous |
| Hopkinton Dolomite | Silurian |
| Independence Shale | Devonian |
| Iola Formation | Carboniferous |
| Ion Formation | Ordovician |
| Kansas City Group/Swope Formation | Carboniferous |
| Keokuk Limestone | Carboniferous |
| LaPorte City Formation | Silurian |
| Lecompton Formation | Carboniferous |
| Lime Creek Formation | Devonian |
| Lost Branch Formation | Carboniferous |
| Maquoketa Group | Ordovician |
| Maquoketa Group/Brainard Shale | Ordovician |
| Maquoketa Group/Fort Atkinson Limestone | Ordovician |
| Maquoketa Group/Neda Formation | Ordovician |
| Maquoketa Group/Scales Shale | Ordovician |
| Marmaton Group/Labette | Carboniferous |
| Maynes Creek Formation | Carboniferous |
| McCraney Limestone | Carboniferous |
| Mifflin Formation | Ordovician |
| Mosalem Formation | Silurian |
| Nachusa Formation | Ordovician |
| North Hill Group/English River | Devonian |
| Oneota Formation | Ordovician |
| Pawnee Formation | Carboniferous |
| Pecatonica Formation | Ordovician |
| Pella Formation | Carboniferous |
| Platteville Group/Grand Detour Formation | Ordovician |
| Platteville Group/Mifflin Formation | Ordovician |
| Platteville Group/Pecatonica Formation | Ordovician |
| Platteville Group/Quimbys Mill Formation | Ordovician |
| Prosser Limestone | Ordovician |
| Quimbys Mill Formation | Ordovician |
| Racine Formation | Silurian |
| Saturday Mountain Formation | Ordovician |
| Scotch Grove Formation | Silurian |
| Shawnee Group/Deer Creek Limestone | Carboniferous |
| Shawnee Group/Kanwaka Formation | Carboniferous |
| Shawnee Group/Oread Limestone | Carboniferous |
| Shell Rock Formation | Devonian |
| Spechts Ferry Formation | Ordovician |
| Spillville Formation | Devonian |
| St. Louis Formation | Carboniferous |
| St. Peter Sandstone | Ordovician |
| Stanton Formation | Carboniferous |
| Stewartville Formation | Ordovician |
| Swope Formation | Carboniferous |
| Traverse Group/Cedar Valley Formation | Devonian |
| Wapsipinicon Formation | Devonian |
| Warsaw Formation | Carboniferous |
| Wassonville Formation | Carboniferous |
| Wise Lake Formation | Ordovician |
| Yellow Springs Group/Sheffield Formation | Devonian |