Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Decorah Shale  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Ordovician | |
| ....Middle Ordovician | |
| .....Decorah Shale | |
| RT | Iowa |
| Missouri | |
| Illinois | |
| Wisconsin | |
| Minnesota | |
| Millbrig Bentonite Bed | |
| SN | W Illinois, NE Iowa, S Minnesota, N Missouri and SW Wisconsin. Added to Thesaurus in 1989. |