Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Blackleaf Formation  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Mesozoic | |
| ...Cretaceous | |
| ....Lower Cretaceous | |
| .....Blackleaf Formation | |
| RT | Montana |
| Colorado Group | |
| Sweetgrass Arch | |
| SN | Lower Cretaceous. NW and central Montana. In Colorado Group. Members ascending are Flood Member, Taft Hill Member, Vaughn Member, and Bootlegger Member. Underlies Marias River Shale; overlies Kootenay Formation. Added to Thesaurus in 1993. |