Ankylopollexia Cerapoda Dinosauria Genasauria Hadrosauridae Hadrosauriformes Hadrosauroidea Hadrosauromorpha Iguanodontia Late Cretaceous Neornithischia North America Ornithischia Ornithopoda Saurolophinae Saurolophini Styracosterna

Prosaurolophus maximus

Dinosaur: Prosaurolophus maximus

Cretaceous: 83.6–72.1 Ma

TRIASSIC

JURASSIC

CRETACEOUS

252

201

145

Type: Ornithopod

*Length:**	9.3 m	30.5 ft
*Weight:**	3.5 tons	7,716 lb

ESR: 3.5 / 4 (estimated size reliability)
*The largest known specimen

Area: North America

Period

Epoch: Late Cretaceous
Stage: Middle-Late Campanian
Years: 83.6–72.1 Ma

Details

Status: valid
Author: Brown
Year: 1916

Distribution

Area: North America
Country: Canada, USA
Region: Alberta, Montana
Formation: Dinosaur Park, Bearpaw, Two Medicine

Classification

Dinosauria
Ornithischia
Genasauria
Neornithischia
Cerapoda
Ornithopoda
Iguanodontia
Ankylopollexia
Styracosterna
Hadrosauriformes
Hadrosauroidea
Hadrosauromorpha
Hadrosauridae
Saurolophinae
Saurolophini

Sources

Material: At least over a dozen individuals (include skulls).
References: Drysdale et al. (2019). Description of juvenile specimens of Prosaurolophus maximus (Hadrosauridae: Saurolophinae) from the Upper Cretaceous Bearpaw Formation of southern Alberta, Canada, reveals ontogenetic changes in crest morphology. McGarrity, C. T.; Campione, N. E.; Evans, D. C. (2013). "Cranial anatomy and variation in Prosaurolophus maximus (Dinosauria: Hadrosauridae)".