Montana

Montana is a northwestern U.S. state known for the Rocky Mountains, the Great Plains, and extensive Late Cretaceous fossil deposits.

Hell Creek Formation: A Late Cretaceous rock formation in Montana, North Dakota, South Dakota, and Wyoming, known for dinosaur fossils. Its Montana exposures preserve fossils from the final few million years of the Cretaceous.
Cretaceous–Paleogene boundary: A geological boundary marking the end of the Cretaceous Period and the beginning of the Paleogene. Montana’s uppermost Cretaceous deposits preserve fossils close to this boundary.
Montana geology: The geological structure and history of Montana, including its mountains, basins, and sedimentary plains. It links ancient fossil-bearing strata to the forces that built the state’s landscape.
Dinosaur paleontology: The scientific study of dinosaurs through fossils and geological evidence. Montana fossil sites have contributed substantially to knowledge of dinosaur diversity and behavior.
Two Medicine Formation: A Late Cretaceous rock formation in northwestern Montana containing abundant dinosaur fossils. Its fossil beds record dinosaurs and other animals living in Montana roughly 75 million years ago.
Western Interior Seaway: A vast inland sea that divided North America during much of the Cretaceous Period. Its retreat helped shape the environments recorded in Montana’s Late Cretaceous strata.
Rocky Mountains: A major mountain system extending through western North America. The Rockies occupy western Montana and reflect the region’s long tectonic history.
Paleontology of the Hell Creek Formation: Research on fossils from a Late Cretaceous formation spanning parts of the northern Great Plains. Montana’s Hell Creek exposures make the state central to studies of end-Cretaceous ecosystems.
Judith River Formation: A Late Cretaceous rock formation in Montana and Alberta containing diverse dinosaur fossils. It preserves Montana ecosystems older than those of the Hell Creek Formation.
Laramide orogeny: A mountain-building episode that raised the Rocky Mountains in western North America during the Late Cretaceous and early Paleogene. Its uplift influenced the sediment sources and landscapes preserved across Montana.

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