The Paleozoic ERA is an ERA of geological time that lasted from 541 million years ago to 251 million years ago. It is divided into six periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The Paleozoic ERA is known for the evolution of many different kinds of life forms, including the first fish, amphibians, reptiles, and land plants. It is also known for the formation of the supercontinent Pangaea. The three-letter abbreviation for the Paleozoic ERA is ERA.