Genus · Ceratopsidae · Cretaceous

Pachyrhinosaurus

Named by Sternberg 1950

Pachyrhinosaurus lived 83.6–66 million years ago, during the Campanian to Maastrichtian stages of the Late Cretaceous. The Paleobiology Database lists 16 fossil records for it from 2 countries (Canada and United States) — the 74th most of the 99 genera on this site.

Where it sits in time

Key facts from the records

Its records are spread over at least 5 formations; the largest share, 31%, is from the Horseshoe Canyon Formation.
Troodon appears in 40% of the collections that hold Pachyrhinosaurus; Edmontosaurus in 27%.
Its stage range spans about 17.6 million years (15th longest of 99); it is the 7th best-recorded of the 11 horned dinosaurs here.

3 accepted species

Species	Named by	Records
Pachyrhinosaurus canadensis	Sternberg 1950	6
Pachyrhinosaurus lakustai	Currie et al. 2008	1
Pachyrhinosaurus perotorum	Fiorillo and Tykoski 2012	1

Where it was found

16 records with coordinates.

Found alongside

Rock formations

Horseshoe Canyon5
Wapiti4
St. Mary River4
Prince Creek2
Summit Creek1

States & provinces

Region	Records	Share
Alberta	13	81%
Alaska	2	12%
Northwest Territories	1	6%

Country	Records	Share
Canada	14	88%
United States	2	12%

Records by stage

Well-dated records, by the stage of their mid-point age.

Campanian3
Maastrichtian7

Depositional settings

Crevasse splay1
Dry floodplain1
Floodplain1
Delta plain1
Channel1
Wet floodplain1

Other horned dinosaurs of its time

Same group, overlapping stage range, not found in the same collections.

Genus	Age	Country	Records
Triceratops	72.1–66 Ma	United States, Canada	166
Centrosaurus	83.6–72.1 Ma	Canada, United States	57
Protoceratops	83.6–72.1 Ma	Mongolia, China	38
Chasmosaurus	83.6–72.1 Ma	Canada, United States	21
Bagaceratops	83.6–72.1 Ma	Mongolia, China	18
Agujaceratops	83.6–72.1 Ma	United States, Mexico	16
Pentaceratops	83.6–72.1 Ma	United States	14
Monoclonius	83.6–72.1 Ma	United States, Canada	13

Also from these formations