| Stratigraphic Name | Age | Lithology | Occurrence Records |
|---|
| Lance | 72.1 - 66.0 Ma
Late/Upper Cretaceous | mudstone/sandstone | 1 |
| Morrison | 151 - 89.8 Ma
Mesozoic | sandstone, mudstone, "siliciclastic", "shale"/siltstone, sandstone/"shale", "limestone"/claystone, sandstone/mudstone, siltstone/claystone, claystone, sandstone/siltstone, siltstone/"limestone", mudstone/siltstone, mudstone/sandstone, grainstone/siltstone, conglomerate, conglomerate/sandstone, "limestone"/mudstone, siltstone/sandstone, mudstone/claystone, siltstone, sandstone/"limestone", lime mudstone/mudstone | 445 |
| Niobrara | 83.5 - 70.6 Ma
Late/Upper Cretaceous | sandstone/"shale", "shale", chalk | 22 |
| Niobrara - Smoky Hill Chalk | 86.3 - 66.0 Ma
Late/Upper Cretaceous | lime mudstone, chalk | 15 |
| Pierre Shale | 70.6 - 66.0 Ma
Late/Upper Cretaceous | shale/"limestone", "shale", marl/claystone, "limestone", sandstone, siltstone, "siliciclastic" | 273 |
| Pierre Shale - Gammon Ferruginous | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale/ash | 4 |
| Pierre Shale - lower unnamed shale | 83.6 - 72.1 Ma
Late/Upper Cretaceous | shale/"limestone", "shale"/claystone, "shale", "shale"/ironstone, "shale"/"carbonate" | 110 |
| Pierre Shale - Millwood | 83.5 - 70.6 Ma
Late/Upper Cretaceous | claystone, "shale" | 7 |
| Pierre Shale - Mitten Black Shale | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale/"limestone", "shale" | 82 |
| Pierre Shale - Pembina | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale, "shale"/ash | 38 |
| Pierre Shale - Red Bird Silty | 83.6 - 72.1 Ma
Late/Upper Cretaceous | shale/"limestone", "shale" | 146 |
| Pierre Shale - upper unnamed shale | 72.1 - 66.0 Ma
Late/Upper Cretaceous | shale/"limestone", "shale"/"carbonate" | 133 |
| Montana - Fox Hills | 70.6 - 66.0 Ma
Late/Upper Cretaceous | sandstone | 16 |
| Montana - Pierre Shale - Beecher Island | 70.6 - 66.0 Ma
Late/Upper Cretaceous | limestone/"shale", "limestone" | 8 |
| Montana - Pierre Shale - DeGrey | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale, sandstone/"shale" | 12 |
| Montana - Pierre Shale - Gammon Ferruginous | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale | 12 |
| Montana - Pierre Shale - Kara Bentonitic | 83.6 - 72.1 Ma
Late/Upper Cretaceous | limestone | 6 |
| Montana - Pierre Shale - Lake Creek Shale | 83.6 - 72.1 Ma
Late/Upper Cretaceous | limestone/"shale" | 7 |
| Montana - Pierre Shale - Larimer Sandstone | 83.5 - 70.6 Ma
Late/Upper Cretaceous | siliciclastic | 11 |
| Montana - Pierre Shale - Pembina | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale/conglomerate, "shale", "shale"/ash | 26 |
| Montana - Pierre Shale - Richard Sandstone | 83.5 - 66.0 Ma
Late/Upper Cretaceous | siliciclastic | 3 |
| Montana - Pierre Shale - Salt Grass Shale | 83.6 - 72.1 Ma
Late/Upper Cretaceous | limestone | 8 |
| Montana - Pierre Shale - Sharon Springs | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale, "shale"/"limestone", "limestone" | 49 |
| Montana - Pierre Shale - Virgin Creek | 83.5 - 70.6 Ma
Late/Upper Cretaceous | shale | 4 |
| Montana - Pierre Shale - Weskan Shale | 83.6 - 72.1 Ma
Late/Upper Cretaceous | shale, "shale"/"limestone" | 7 |
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