| Stratigraphic Name | Age | Lithology | Occurrence Records |
|---|
| Arikaree | 20.4 - 5.33 Ma
Miocene | siliciclastic | 278 |
| Arikaree - basal | 30.8 - 20.4 Ma
Cenozoic | | 2 |
| Fort Union - Ekalaka | 63.3 - 61.7 Ma
Paleocene | sandstone | 37 |
| Fort Union - Tullock | 66.0 - 56.0 Ma
Paleocene | lignite, "siliciclastic", not reported/sandstone, sandstone | 56 |
| Hell Creek | 66.0 - 63.3 Ma
Paleocene | sandstone/siltstone, sandstone, mudstone, sandstone/mudstone, siltstone, conglomerate, claystone, "shale", sandstone/conglomerate, mudstone/siltstone, mudstone/"shale", "shale"/siltstone, sandstone/"shale", amber, sandstone/claystone | 4258 |
| Slope | 61.7 - 56.8 Ma
Paleocene | | 37 |
| Tongue River - lower | 61.7 - 56.8 Ma
Paleocene | | 8 |
| Tongue River - Medicine Rocks Sandstone | 63.3 - 61.7 Ma
Paleocene | sandstone | 1 |
| Tullock - Collins Ranch | 66.0 - 63.3 Ma
Paleocene | | 49 |
| Tullock - lower | 66.0 - 63.3 Ma
Paleocene | | 14 |
| Montana - Hell Creek | 70.6 - 66.0 Ma
Late/Upper Cretaceous | mudstone, siltstone, sandstone, sandstone/mudstone, siltstone/sandstone | 100 |
| Montana - Hell Creek - Breien | 70.6 - 66.0 Ma
Late/Upper Cretaceous | sandstone | 22 |
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