https://en.wikipedia.org/wiki/Cenozoic
The Cenozoic (/ ˌ s iː n ə ˈ z oʊ. ɪ k, ˌ s ɛ n-/ SEE-nə-ZOH-ik, SEN-ə-; lit. 'new life') is Earth's current geological era, representing the last 66 million years of Earth's history. It is characterized by the dominance of mammals, birds and flowering plants, a cooling and drying climate, and the current configuration of continents.It is the latest of three geological eras since ...