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Sphaerotholus Sphaerotholus buchholtzae Williamson and Carr 2003
/sfˌɛɹəθˈoʊləs/
estimated
Late Cretaceous (Maastrichtian) · 72.2–66 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 · Saskatchewan
Formations
Hell Creek · Frenchman
Dig sites
2
distinct collections
Overview
Sphaerotholus buchholtzae is a pachycephalosaur dinosaur known from the Late Cretaceous, roughly 72.2–66.0 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 Williamson and Carr 2003. The species is represented by 2 recorded occurrences in the Paleobiology Database.
Fossil Record Completeness
How much of this profile is grounded in the fossil record
~8%
confidence from occurrence count
Based on 2 recorded occurrences in the Paleobiology Database.
Geologic Time
Where Sphaerotholus buchholtzae sits in deep time
Sphaerotholus
252 Mya201 Mya145 Mya66 Mya
Relationships
Part of a wider fossil web
These species share Sphaerotholus buchholtzae'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.