Cretaceous
Avaceratops
Avaceratops lammersi
The catalogue presents Avaceratops as a herbivore member of Ceratopsidae that lived during the Cretaceous, between 80.0–74.0 Ma. Its estimated range is 2.5–4.0 m in length and 500–900 kg in mass, giving a practical sense of scale. Reference material comes from Judith River Formation, Montana, USA. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Avaceratops, the PBDB records the taxonomic attribution as Dodson (1986).
The PBDB places it in Nasutoceratopsini, and the catalogue record assigns it to the family Ceratopsidae.
- PBDB · taxon.parent
- Ceratopsidae
In the PBDB record, the reported stratigraphic range is the Campanian.
The PBDB catalogues 1 occurrence, with material from the Judith River Formation (1). Provenance: United States.
The catalogue records the type locality as “Judith River Formation, Montana, USA”.
- Judith River Formation, Montana, USA
The catalogue's reference measurements are 2.5–4.0 m in length and 500–900 kg in mass — estimates, which vary with specimen and method.
- 2.5-4.0 m
- 500-900 kg
The record gathers 18 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
- 2.5–4.0 m
- Weight
- 500–900 kg
- Period
- Cretaceous
- Time range
- 80.0–74.0 Ma
Discovery Information
- First Discovery
- 1986
- Described by
- Dodson
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Ornithischia
- Family
- Ceratopsidae
- Genus
- Avaceratops
- Species
- A. lammersi
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
- not documented in this catalogue
- Type locality
- Judith River Formation, Montana, USA