Cambrian System
Stratigraphic column is from ISGS Bulletin 95 (1975).
- Sauk Sequence
- Knox Dolomite Megagroup
- Cambrian System
- Croixan Series
- Trempealeauan Stage
- Eminence Formation
- Jordan Sandstone
- Momence Sandstone Member
- Potosi Dolomite
- Franconian Stage
- Derby-Doerun Member
- Potsdam Sandstone Megagroup
- Franconia Formation
- Davis Member
- Ironton Sandstone
- Mooseheart Member
- Marywood Member
- Fox Valley Member
- Buelter Member
- Dresbachian Stage
- Galesville Sandstone
- Eau Claire Formation
- Proviso Siltstone Member
- Lombard Dolomite Member
- Elmhurst Sandstone Member
- Mt. Simon Sandstone
- Charter Member
- Gunn Member
- Lacey Member
- Mayfield Member
- Lovell Member
- Kenyon Member
- Crane Member