Genus · Ceratopsidae · Cretaceous

Monoclonius

Named by Cope 1876

Monoclonius lived 83.6–72.1 million years ago, during the Campanian stage of the Late Cretaceous. The Paleobiology Database lists 13 fossil records for it from 2 countries (United States and Canada) — the 91st 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, 38%, is from the Oldman Formation.
Kritosaurus appears in 8% of the collections that hold Monoclonius; Lambeosaurus in 8%.
Its stage range spans about 11.5 million years (36th longest of 99); it is the 10th best-recorded of the 11 horned dinosaurs here.

1 accepted species

Monoclonius has a single accepted species in PBDB.

Species	Named by	Records
Monoclonius crassus	Cope 1876	2

Where it was found

13 records with coordinates.

Found alongside

Rock formations

States & provinces

Region	Records	Share
Alberta	6	46%
Montana	4	31%
New Mexico	3	23%

Country	Records	Share
United States	7	54%
Canada	6	46%

Other horned dinosaurs of its time

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

Genus	Age	Country	Records
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
Pachyrhinosaurus	83.6–66 Ma	Canada, United States	16
Pentaceratops	83.6–72.1 Ma	United States	14

Also from these formations

Data: PBDB taxon 38857 · method