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Cenozoic
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Cenozoic, by Wikipedia https://en.wikipedia.org/wiki?curid=5816 / CC BY SA 3.0 • #Cenozoic • #Geological_eras • The Cenozoic （/ˌsiːnəˈzoʊ.ɪk, ˌsɛn-/ 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 complex life evolved, preceded by the Mesozoic and Paleozoic. • It started with the Cretaceous–Paleogene extinction event, when many species, including the non-avian dinosaurs, became extinct in an event attributed by most experts to the impact of a large asteroid or other celestial body, the Chicxulub impactor. • The Cenozoic is also known as the Age of Mammals because the terrestrial animals that dominated both hemispheres were mammals – the eutherians • （placentals） in the northern hemisphere and the metatherians （marsupials, now mainly restricted to Australia） in the southern hemisphere. • The extinction of many groups allowed mammals and birds to greatly diversify so that large mammals and birds dominated the Earth. • The continents also moved into their current positions during this era. • The Earth's climate had begun a drying and cooling trend, culminating in the glaciations of the Pleistocene Epoch, and partially offset by the Paleocene-Eocene Thermal Maximum. • Cenozoic derives from the Greek words kainós （καινός 'new'） and zōḗ （ζωή 'life'）. • The name was proposed in 1840 by the British geologist John Phillips （1800–1874）, who originally spelled it Kainozoic. • The era is also known as the Cænozoic, Caenozoic, or Cainozoic （/ˌkaɪ.nəˈzoʊ.ɪk, ˌkeɪ-/）. • In name, the Cenozoic （lit. 'new life'） is comparable to the preceding Mesozoic （'middle life'） and Paleozoic （'old life'） Eras, as well as to the Proterozoic （'earlier life'） Eon. • The Cenozoic is divided into three periods: the Paleogene, Neogene, and Quater...
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