Litostratigrafie
Karbon
Bez zařazení do stupně
Gilmore City formation (Mississippian)
Silur
| Ludford | Racine dolomite (Homer – Ludford) |
| Gorst | Racine dolomite (Homer – Ludford) |
| Homer | Racine dolomite (Homer – Ludford) |
Ordovik
| Katian | Dunleith formation Maquoketa formation Scales formation |
| Sandbian | Platteville limestone |
| Darriwil | Winneshiek shale |