Measured Hell Creek occurrences place Tyrannosaurus in latest Maastrichtian strata up to the K–Pg boundary; the 68–66 Ma atlas envelope is rounded and does not claim a global genus origination at 68 Ma.
claim:taxon:tyrannosaurus:fossil-rangeAtlas home / References / Dinosaur census reveals abundant Tyrannosaurus and rare ontogenetic stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA
References / paperDinosaur census reveals abundant Tyrannosaurus and rare ontogenetic stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA
Horner, J.R.; Goodwin, M.B.; Myhrvold, N.
Year2011
Source roleprimary-study
DOI / ID10.1371/journal.pone.0016574
Fitness and scope
range · ecology · methods · biogeography
The field census records taxon, locality and stratigraphic position; abundance and ontogenetic interpretation remain sampling-sensitive.
Claim ledger
Tyrannosaurus specimens are documented in western North American latest Maastrichtian formations; broader dispersal routes inferred for tyrannosaurids remain model-dependent and are not treated as direct Tyrannosaurus movements.
claim:taxon:tyrannosaurus:biogeography