Mesozoic Era
It was part of the Mesozoic Era.
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 Paleogene Period followed the Cretaceous.
It is the final period of the Mesozoic era.
The dinosaurs lived in the Mesozoic Era, which includes the Triassic, Jurassic, and Cretaceous periods. The first dinosaurs appeared in the late Triassic and went extinct at the end of the Cretaceous.
The dinosaurs died out 65.5 million years ago. That was the very end of the Maastrichtian stage, which was the last stage of the Cretaceous time period. The Cretaceous was the last period of the Mesozoic era.
mesozoic
The Paleocene, which is the first (oldest) part of the Cenozoic Era, as the Cretaceous was the last of the Mesozoic Era.
The Cretaceous / Tertiary boundary (KT) occurred 65 million years ago and extinctions of most dinosaurs was probably due to a meteorite impact in the Yucutan peninsular of Mexico known as the Chixulub crater.
The question is very muddled but it can be answeredThe Cenozoic Era started with the end of the dinosaurs and is ongoing 65.5 mya to the present thereforeOf the above the following are in the Cenozoic:QuaternaryTertiaryAnd the following are out of (older than) the Cenozoic:Cretaceous
There were three periods in the Mesozoic Era. The Triassic Period, the Jurassic period & the Cretaceous Period.
Dinosaurs existed from 230 to 65.5 million years ago. That was from the mid Triassic period to the end of the Cretaceous period. All three periods were in the Mesozoic era.