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| Fort Atkinson Limestone | |
|---|---|
| Stratigraphic range: Ordovician | |
| Type | Formation |
| Unit of | Maquoketa Group |
| Underlies | Brainard Shale and Whitewater Formation |
| Overlies | Scales Shale |
| Location | |
| Region | Illinois, Indiana |
| Country | United States |
The Fort Atkinson Limestone is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Salem Formation is a geologic formation in Illinois, Indiana, Kentucky, and Missouri. It preserves fossils dating back to the Mississippian subperiod. This formation is quarried and used as a building material, known as "Indiana limestone", also called Bedford limestone.
The Chouteau Limestone is a geologic formation in Illinois, Iowa, Kansas, and Missouri. It preserves fossils dating back to the Carboniferous period.
The Bond Formation is a geologic formation in Illinois, Kentucky and Indiana. It preserves fossils dating back to the Carboniferous period.
The Patoka Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period.
The Paint Creek Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period.
The Warsaw Formation is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian subperiod.
The Grand Tower Limestone is a geologic formation in Illinois. It preserves fossils dating back to the Devonian period.
The St. Laurent Formation is a geologic formation in Illinois. It preserves fossils dating back to the Devonian period.
The Dunleith Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Wise Lake Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Glenwood Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Grand Detour Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Brainard Shale is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Neda Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Scales Shale is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Nachusa Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Pecatonica Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Quimbys Mill Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Mosalem Formation is a geologic formation in Illinois. It preserves fossils dating back to the Silurian period.
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