Tyrannosaurus rex was the apex predator of the local habitat, where they and Triceratops lived. T-rex may even have hunted Triceratops. However, because they were herbivores, Triceratops were far more common than T-rex. I'm not sure which of those you consider dominant.
Triceratops lived in the late cretaceous period.
Triceratops lived in the Cretaceous period.
Some animals during the cretaceous period were tapejara, microraptor, and velociraptor. There was also triceratops, styracosaurus, and the tyrannosaurus rex.
Late Cretaceous
My cousin lenny
The dinosaurs were the dominant land animals during the Jurassic and Cretaceous periods, rising to dominance during the late Triassic.
The Triceratops lived about 65,000,000 years ago during the Late Cretaceous period. The Triceratops lived in areas of North America, specifically Wyoming and Colorado.
Triceratops existed from 68 to 65.5 million years ago. That was at the end of the Maastrichtian stage, the last stage of the Cretaceous period, which was the last period of the Mesozoic. In fact, Triceratops existed at the very end of the Mesozoic era and was one of the dinosaurs wiped out by the K-T extinction.
The T-Rex and Triceratops. The extinction of the dinosaurs marked the end of the cretaceous period.
The Torosaurus (the cousin of the Triceratops, except it's head is more massive) lived during the late Cretaceous Period.
Triceratops fossils date to between 68 and 65.5 million years ago. This was during the Maastrichtian stage of the Cretaceous period of the Mesozoic era.
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