Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Empire Formation  | |
|---|---|
| RT | Alaska |
| Belt Supergroup | |
| Mesoproterozoic | |
| Miocene | |
| Missoula Group | |
| Montana | |
| Oregon | |
| SN | In Missoula Group of Belt Supergroup. W central Montana. Also occurs in the Miocene of Oregon and Alaska. Indexed with age as applicable. Added to Thesaurus in 1985. |