Search SEDIS
| Data sets | Publications | Expeditions | Thesaurus |
Montana Group  | |
|---|---|
| BT | Chronostratigraphic Units |
| .Phanerozoic | |
| ..Mesozoic | |
| ...Cretaceous | |
| ....Upper Cretaceous | |
| .....Montana Group | |
| RT | New Mexico |
| Utah | |
| Wyoming | |
| Montana | |
| Colorado | |
| North Dakota | |
| Bearpaw Formation | |
| Kansas | |
| South Dakota | |
| Cody Shale | |
| Eagle Sandstone | |
| Fox Hills Formation | |
| Pierre Shale | |
| Judith River Formation | |
| Parkman Sandstone | |
| Two Medicine Formation | |
| SN | Includes Bearpaw Shale, Claggett Shale, Cody Shale (upper part), Eagle Sandstone, Fox Hills Sandstone, Horsethief Sandstone, Judith River Formation, Lennep Sandstone, Parkman Sandstone, Pierre Shale, Trinidad Sandstone, Two Medicine Formation, and Virgell |