The Cenozoic Era

The image is a mastadon which is an early elephant


Tertiary- 1.8 million years ago to present time

Qaurtenary- 66 to 1.8 million years ago


 The Mesozoic Era

The image is two T-rex's which are meat-eating dinosaurs


Creatceous- 144 to 66 million years ago

Jurassic- 200 to 144 million years ago

Triassic- 245 to 200 million years ago


The Paleozoic Era

The picture is of prehistoric squid.


Permian- 290 to 245 million years ago

Carboniferous- 352 to 290 million years ago

Devonian- 408 to 352 million years ago

Silurian- 440 to 408 million years ago

Ordovician- 510 to 440 million years ago

Cambrian- 550 to 510 million years ago

Pre-Cambrian- 553 to 550 million years ago