1. Paleozoic Era: This era spans from about 541 million years ago to 252 million years ago and is characterized by the diversification of life, including the first vertebrates, land plants, and insects. It is divided into six periods: Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.
2. Mesozoic Era: This era spans from about 252 million years ago to 66 million years ago and is known for the rise of the dinosaurs, the appearance of the first birds and mammals, and the breakup of the supercontinent Pangaea. It is divided into three periods: Triassic, Jurassic, and Cretaceous.
These two eras are followed by the Cenozoic Era which began 66 million years ago and continues to the present.
