Time period help?

Question

According to my research, the stegosaurus lived 145 million years ago. Wha time period is that?

Answer 1

The Stegosaurus lived during the late Jurasic period

Answer 2

stegosaur

- dinosaur with bony plates and spikes: a plant-eating dinosaur that lived in the Mesozoic Era in the Period of Jurassic and Early Cretaceous during the Epoch of Middle Jurassic to late or Upper Cretaceous

Mesozoic 248 million to 65 million years ago

Mesozoic Era has 3 periods

Triassic 248 to 206 million years ago

Jurassic 206 to 144 million years ago

Cretaceous 144 to 65 million years ago

Each period is broken down into Epochs as listed above