Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Millbrig Bentonite Bed  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Ordovician | |
| ....Middle Ordovician | |
| .....Millbrig Bentonite Bed | |
| RT | Iowa |
| Missouri | |
| Illinois | |
| Wisconsin | |
| Minnesota | |
| Decorah Shale | |
| SN | Of Glencoe Member of Spechts Ferry Formation in NW Illinois and Wisconsin. Also may be of Decorah Shale in Iowa, Minnesota, and Missouri. Added to Thesaurus in 1995. |