Blackleaf Formation
Geologic formation in the United States / From Wikipedia, the free encyclopedia
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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]
Quick Facts Type, Unit of ...
Blackleaf Formation | |
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Stratigraphic range: late Albian-Cenomanian ~105–94 Ma | |
Type | Formation |
Unit of | Colorado Group |
Lithology | |
Primary | Mudstone, sandstone |
Other | Shale, siltstone |
Location | |
Coordinates | 44.5°N 112.6°W / 44.5; -112.6 |
Approximate paleocoordinates | 45.9°N 72.3°W / 45.9; -72.3 |
Region | Montana |
Country | United States |
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