| Cedar Valley Group | |
|---|---|
| Stratigraphic range: Devonian | |
| Type | Group |
| Overlies | Wapsipinicon Group |
| Location | |
| Region | Iowa and Illinois |
| Country |  United States |
The Cedar Valley Group is a geologic group in Iowa and Illinois. It preserves fossils dating back to the Devonian period.
The Cincinnati Group is a geologic group in Kentucky, Ohio and Indiana. It is Upper Ordovician.
The Harrodsburg Limestone is a geologic formation, a member of the Sanders Group of Indiana Limestone, of Mississippian age. It was named for Harrodsburg in southern Monroe County, Indiana by T. C. Hopkins and C. E. Siebenthal. It is made up primarily of calcarenite and calcirudite. It also may include some beds of dolomite and shale.
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 Keokuk Limestone is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian sub-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 Glenwood Formation 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 Quimbys Mill Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
The Gower Formation is a geologic formation in Illinois and Iowa. It preserves fossils dating back to the Silurian period.
The Cherokee Group is a Pennsylvanian geologic group in Missouri and Iowa. The group contains most of the economic coal deposits of Missouri and Iowa.
The Burlington Limestone is a geologic formation in Missouri, Iowa and the Midwest region. It preserves fossils dating back to the Mississippian subperiod.
The Shawnee Group is a geologic group in Iowa. It preserves fossils dating back to the Carboniferous period.
The Hampton Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
The St. Louis Formation is a geologic formation in Iowa. It preserves fossils dating back to the Carboniferous period.
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