1. Cenozoic Era: This is the current era, starting about 66 million years ago after the extinction of the dinosaurs. It is characterized by the rise of mammals and the development of modern plant life.

2. Mesozoic Era: This era lasted from about 252 to 66 million years ago and is known as the "Age of Reptiles." Dinosaurs dominated the land, while marine reptiles ruled the oceans.

3. Paleozoic Era: This era spanned from about 541 to 252 million years ago. It saw the evolution of the first vertebrates, the colonization of land by plants and animals, and the formation of supercontinents.

Let me know if you'd like more information on any of these eras!