Late Cretaceous

Campanian 83 - 74 mya

Judith River Montana

North central Montana it is generally known as the Judith River Formation and is contemporaneous with the Oldman Formation. The community structure and the paleoecology of the fauna of the Judith River Formation resemble those of the Lance Formation. The greatest difference between the two communities is the greater variety of dinosaurs in the earlier formation.

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Judith River Horned dinosaurs