National Natural Landmarks

Hell Creek Fossil Area

Hell Creek Fossil Area
Hell Creek Fossil Area

The Hell Creek formation and valley is the type locality for Tyrannosaurus rex, Ankylosaurus magniventris, and Brachychampsa fontana, the oldest known true alligator. The Hell Creek Fossil Area has also produced several specimen of Triceratops prorsus and is where over 95% of T. rex museum specimens have come from.

Location: Garfield County, MT ; Garfield County, MT

Year designated: 1966

Acres: 34,435

Ownership: Federal, State, Private

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Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.


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