Names of prehistoric eras?

The Eras go like this:

Precambrian Era

Paleozoic Era

Mesozoic Era

Cenozoic Era

Dinosaurs lived during the Mesozoic Era, and we live in the Cenozoic Era.

Paleozoic means "ancient life"

Mesozoic means "middle life"

Cenozoic means "recent life"

All eras end in a huge disaster