Cretaceous
Montanoceratops
Montanoceratops cerorhynchus
The catalogue presents Montanoceratops as a herbivore member of Leptoceratopsidae that lived during the Cretaceous, between 70.0–66.0 Ma. Its estimated range is 2.5–3.0 m in length and 150–250 kg in mass, giving a practical sense of scale. Reference material comes from St. Mary River Formation, Montana, USA. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Montanoceratops, the PBDB records the taxonomic attribution as Sternberg (1951).
The PBDB places it in Leptoceratopsidae, and the catalogue record assigns it to the family Leptoceratopsidae.
- PBDB · taxon.parent
- Leptoceratopsidae
In the PBDB record, the reported stratigraphic range runs from the Campanian to the Maastrichtian.
The PBDB catalogues 3 occurrences, with material from the St. Mary River Formation (2) and from the Horseshoe Canyon Formation (1). Provenance: United States and Canada.
The catalogue records the holotype as AMNH 5464 and the type locality as “St. Mary River Formation, Montana, USA”.
- AMNH 5464
- St. Mary River Formation, Montana, USA
The catalogue's reference measurements are 2.5–3.0 m in length and 150–250 kg in mass — estimates, which vary with specimen and method.
- 2.5-3.0 m
- 150-250 kg
The record gathers 34 bibliographic references registered in the PBDB, listed below.
Where it lived
Fossil occurrences on today’s map and in the tectonic reconstruction.
Positions reconstructed by PBDB/GPlates, not observed; this is not an exact habitat map.
Artistic 3D reconstruction
There is no approved species-specific 3D model yet. Generic anatomy will not be presented as if it were evidence.
Physical Specifications
- Length
- 2.5–3.0 m
- Weight
- 150–250 kg
- Period
- Cretaceous
- Time range
- 70.0–66.0 Ma
Discovery Information
- First Discovery
- 1951
- Described by
- Brown & Schlaikjer
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Ornithischia
- Family
- Leptoceratopsidae
- Genus
- Montanoceratops
- Species
- M. cerorhynchus
Data status
Taxonomic name matched to PBDB and checked on 2026-08-08.
Taxonomic linkage does not automatically validate size, mass, behaviour or appearance.
- Type specimen
- AMNH 5464
- Type locality
- St. Mary River Formation, Montana, USA