Montana, North Dakota, South Dakota, and Wyoming, USA
The Hell Creek Formation is represented in Fossil Atlas by 163 selected fossil records from Montana, North Dakota, South Dakota, and Wyoming, USA. Notable fossil animals mapped here include Tyrannosaurus rex, Triceratops, Ankylosaurus, Edmontosaurus, Pachycephalosaurus. These pins are modern fossil discovery locations, not a complete ancient habitat map.
This remains a formation profile: the description, timeline, notable animals, and evidence sections stay intact. The fossil-map answer is surfaced here so visitors from search can orient themselves before reading the full dossier.
A latest Cretaceous rock unit across the northern Great Plains, famous for preserving Tyrannosaurus rex, Triceratops, and other vertebrates close to the end-Cretaceous extinction interval.
Position of this formation’s known age range across 252 million years of the Mesozoic and beyond.
68-66 million years ago
Animals with source-backed fossil records in the current dataset that are associated with the Hell Creek Formation.
Pins show selected fossil records for the Hell Creek Formation; use them as modern discovery evidence, not a complete range map. Modern fossil discovery map: pins show where selected fossil and specimen records were found today, not ancient Earth positions. What does this mean?
Turn this formation’s geologic age range, notable animals, and 163 mapped discovery records into a source-stamped 4:5 card built for Instagram, Reddit, X, Discord, and Pinterest.
The Hell Creek Formation is a fossil-bearing rock unit exposed in Montana, North Dakota, South Dakota, and Wyoming, USA. Fossil Atlas maps selected occurrence records from this formation as modern discovery locations.
No. The map shows modern fossil discovery locations from selected records in this formation. Ancient habitat and paleogeographic reconstructions are separate questions.
Notable fossil animals mapped within this formation include Tyrannosaurus rex, Triceratops, Ankylosaurus, Edmontosaurus, Pachycephalosaurus. Formation coverage depends on the selected dataset and may not be complete.
Yes. Use the expedition card generator to turn the Hell Creek Formation map and notable animals into a shareable card.
Selected fossil records from PBDB and museum biodiversity aggregators. Source labels and confidence notes help distinguish canonical paleobiology records from specimen-media records.
Formation profiles and notable animal lists reflect the current selected dataset. Fossil maps show modern discovery locations, not paleogeographic reconstructions. Age ranges are approximate and subject to revision as new stratigraphic data becomes available.
Maps use curated PBDB, museum, and specimen-source records with visible caveats.
Pins show where fossils were found or reported today, not exact ancient habitat positions.
Artwork is labeled separately from specimen photos, maps, and source records.
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