1,384 wells on file. Open this county on the map.
Depth range is measured from the wells on file, not a regional average.
| Formation | Wells | Producing | Shallowest | Average | Deepest | Cumulative |
|---|---|---|---|---|---|---|
| Mississippian | 244 | 31 | 1,891 ft | 2,705 ft | 3,449 ft | — |
| Arbuckle Group | 83 | 3 | 2,675 ft | 3,548 ft | 3,966 ft | — |
| Viola Limestone | 80 | 0 | 259 ft | 3,320 ft | 3,696 ft | — |
| Maquoketa Shale | 68 | 1 | 1,461 ft | 3,347 ft | 3,685 ft | — |
| Simpson Group Lower | 41 | 6 | 3,359 ft | 3,540 ft | 3,781 ft | — |
| Ordovician System | 16 | 6 | 500 ft | 3,341 ft | 3,865 ft | — |
| Simpson | 9 | 0 | 2,826 ft | 3,466 ft | 3,880 ft | — |
| Maquoketa | 9 | 1 | 3,253 ft | 3,935 ft | 7,854 ft | — |
| Mississippian System | 9 | 5 | 2,595 ft | 2,726 ft | 3,669 ft | — |
| Mississippi | 9 | 4 | 2,600 ft | 2,730 ft | 2,770 ft | — |
| Mqkt | 7 | 0 | 3,222 ft | 3,309 ft | 3,442 ft | — |
| Maquoeta | 7 | 0 | 3,165 ft | 3,232 ft | 3,320 ft | — |
| Arbuckle | 6 | 0 | 443 ft | 3,124 ft | 3,862 ft | — |
| Viol | 5 | 2 | 3,296 ft | 3,409 ft | 3,467 ft | — |
| Maquoeta Dolomite | 4 | 0 | 3,156 ft | 3,204 ft | 3,260 ft | — |
| Xmississippi | 3 | 0 | 2,678 ft | 2,685 ft | 2,696 ft | — |
| Viola | 3 | 1 | 3,253 ft | 3,397 ft | 3,669 ft | — |
| Mississippi A | 2 | 0 | 2,620 ft | 2,653 ft | 2,686 ft | — |
| Wellington | 2 | 0 | 2,670 ft | 3,003 ft | 3,335 ft | — |
| Cambrian System | 2 | 0 | 3,416 ft | 3,591 ft | 3,765 ft | — |
| Cretaceous System | 2 | 0 | 563 ft | 694 ft | 825 ft | — |
| Precambrian System | 2 | 1 | 3,600 ft | 3,873 ft | 4,145 ft | — |
| Hunton Group | 2 | 0 | 3,135 ft | 3,203 ft | 3,270 ft | — |
| Permian System | 1 | 0 | 595 ft | 595 ft | 595 ft | — |
| Lansing, Mississippi & Viola | 1 | 0 | 3,450 ft | 3,450 ft | 3,450 ft | — |
| Douglas Group | 1 | 0 | 1,930 ft | 1,930 ft | 1,930 ft | — |
| Mqkdlm | 1 | 0 | 3,375 ft | 3,375 ft | 3,375 ft | — |
| Springer | 1 | 0 | 3,570 ft | 3,570 ft | 3,570 ft | — |
| Topeka Limestone | 1 | 0 | 3,375 ft | 3,375 ft | 3,375 ft | — |
| Cherokee | 1 | 0 | 2,707 ft | 2,707 ft | 2,707 ft | — |
| Maquoketa Dolo | 1 | 1 | 3,457 ft | 3,457 ft | 3,457 ft | — |
| Burlington Limestone | 1 | 0 | 2,695 ft | 2,695 ft | 2,695 ft | — |
| Wabaunsee Group | 1 | 0 | 1,800 ft | 1,800 ft | 1,800 ft | — |
| Warsaw Limestone | 1 | 0 | 2,778 ft | 2,778 ft | 2,778 ft | — |
| Mississippi, Simpson | 1 | 0 | 3,451 ft | 3,451 ft | 3,451 ft | — |
| Burgess Sand | 1 | 0 | 2,623 ft | 2,623 ft | 2,623 ft | — |
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