Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Champlainian  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Ordovician | |
| ....Middle Ordovician | |
| .....Champlainian | |
| RT | Trentonian |
| SN | Provincial series, North America. Above Canadian Series. |