Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Thomson Formation  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Precambrian | |
| ..Proterozoic | |
| ...Paleoproterozoic | |
| ....Thomson Formation | |
| UF | Thomson Slate |
| RT | Wisconsin |
| Minnesota | |
| Animikie Group | |
| Virginia Formation | |
| SN | NE Minnesota and NW Wisconsin. Includes the slate which has been referred to in literature as Thomson, Saint Louis, Cloquet, and Carlton slates. And which has usually been considered an equivalent of the Animikie-Virginia Slate of the Mesabi Range. In NE |