| Blackleaf Formation | |
|---|---|
| Stratigraphic range: late Albian-Cenomanian ~ | |
| Type | Formation |
| Unit of | Colorado Group |
| Lithology | |
| Primary | Mudstone, sandstone |
| Other | Shale, siltstone |
| Location | |
| Coordinates | 44°30′N 112°36′W / 44.5°N 112.6°W |
| Approximate paleocoordinates | 45°54′N 72°18′W / 45.9°N 72.3°W |
| Region |  Montana |
| Country |  United States |
  Blackleaf Formation (the United States)  Blackleaf Formation (Montana) | |
The Blackleaf Formation is a geologic formation in Montana. It preserves fossils dating back to the Albian to Cenomanian stages of the Cretaceous period.[1]
- ^ Blackleaf Formation at Fossilworks.org