Cenozoic

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  • Cenozoic
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Abstract from DBPedia
    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 life on Earth. The continents also moved into their current positions during this era. The climate during the early Cenozoic was warmer than today, particularly during the Paleocene–Eocene Thermal Maximum. However, the Eocene to Oligocene transition and the Quaternary glaciation dried and cooled Earth.

    新生代(しんせいだい、英: Cenozoic era)は、古生代・中生代・新生代と分かれる地質時代、顕生代の大きな区分の一つである。多くの場合は鳥類を除いた恐竜絶滅後を指す。約6,500万年前から現代までに相当し、陸上では非鳥類型恐竜が絶滅し、海中ではアンモナイトと海生爬虫類が絶滅した後、哺乳類が繁栄したことで特徴づけられる。 新生代は、第四紀・新第三紀・古第三紀の3つの紀に区分される。また、新第三紀と古第三紀を合わせた地質時代を、非公式な用語として第三紀と呼ぶことが許されている。

    (Source: http://dbpedia.org/resource/Cenozoic)