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Brontotholus Brontotholus harmoni Woodruff et al. 2025
/bɹˌɔntəθˈoʊləs/
estimated
Late Cretaceous (Campanian) · 83.6–72.2 Mya
Key Statistics
Diet
herbivore
Locomotion
bipedal
inferred from clade
Habitat
ground-dwelling
Social
herding
Where It Was Found
Countries
United States, Canada
Regions
Montana · Alberta
Formations
Two Medicine · Oldman
Dig sites
3
distinct collections
Overview
Brontotholus harmoni is a pachycephalosaur dinosaur known from the Late Cretaceous, roughly 83.6–72.2 million years ago. It was a herbivore. It is recorded as ground-dwelling and herding. Fossils have been recovered from Montana, United States and elsewhere. It was named by Woodruff et al. 2025. The species is represented by 3 recorded occurrences in the Paleobiology Database.
Fossil Record Completeness
How much of this profile is grounded in the fossil record
~11%
confidence from occurrence count
Based on 3 recorded occurrences in the Paleobiology Database.
Geologic Time
Where Brontotholus harmoni sits in deep time
Brontotholus
252 Mya201 Mya145 Mya66 Mya
Relationships
Part of a wider fossil web
These species share Brontotholus harmoni's place in deep time — computed from overlapping age ranges, shared clades, and inferred ecology. Predator–prey pairs additionally have to have been dug up in the same place.