Dinosaur: "Monoclonius" fissus
Cretaceous: 83.6–72.1 Ma
Period
Epoch: Late Cretaceous
Stage: Middle-Late Campanian
Years: 83.6–72.1 Ma
Details
Status: nomen dubium
Author: Cope
Year: 1889
Distribution
Area: North America
Country: USA
Region: Montana
Formation: Judith River
Sources
Material: Incomplete pterygoid.
References: Dodson, P. (1990). On the status of the ceratopsids Monoclonius and Centrosaurus.
