The Cenozoic era, 65 million years ago, is the latest geological era in the history of the earth. With the extinction of dinosaurs, Mesozoic ended and Cenozoic began. The Cenozoic is divided into three periods: Paleogene and Neogene and Quaternary. The strata formed in this period are called Cenozoic. The Cenozoic era is characterized by the high prosperity of mammals and angiosperms. Because the biological world has gradually taken on a modern look, it is named the Cenozoic era, that is, the era of modern biology.