SEDIS - Thesaurus
Birdbear Formation  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Paleozoic | |
| ...Devonian | |
| ....Upper Devonian | |
| .....Birdbear Formation | |
| RT | Saskatchewan |
| Montana | |
| North Dakota | |
| Williston Basin | |
| Jefferson Group | |
| Nisku Formation | |
| SN | In Jefferson Group. Overlies Duperow Formation. Added to Thesaurus in 1989. |
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