Cenozoic era (65 million years ago, Cenozoic era) 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, Neogene and Quaternary. The total includes seven eras: Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene and Holocene. 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 gradually presents a modern look, it is named the Cenozoic era, that is, the era of modern biology.