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  WordNet (3.0) 
era
(n) a major division of geological time; an era is usually divided into two or more periods, Syn. geological era
  CC-CEDICT CN-EN Dictionary 
新生代
[新 生 代, Xīn shēng dàiㄒㄧㄣ ㄕㄥ ㄉㄞˋ] Cenozoic (geological era covering the last 65m years) #21101
中生代
[中 生 代, Zhōng shēng dàiㄓㄨㄥ ㄕㄥ ㄉㄞˋ] Mesozoic (geological era 250-65m years ago, covering Triassic 三疊紀|三叠纪, Jurassic 侏羅紀|侏罗纪 and Cretaceous 白堊紀|白垩纪, See Also: 三疊紀, 三叠纪, 侏羅紀, 侏罗纪, 白堊紀, 白垩纪 #49026
古生代
[古 生 代, Gǔ shēng dàiㄍㄨˇ ㄕㄥ ㄉㄞˋ] Paleozoic (geological era 545-250m years ago, covering Cambrian 寒武紀|寒武纪, Ordovician 奧陶紀|奥陶纪, Silurian 志留紀|志留纪, Devonian 泥盆紀|泥盆纪, Carboniferous 石炭紀|石炭纪, Permian 二疊紀|二叠纪, See Also: 寒武紀, 寒武纪, 奧陶紀, 奥陶纪, 志留紀, 志留纪, 泥盆紀, 泥盆纪, 石炭紀, 石炭纪, 二疊紀, 二叠纪 #60350
第三纪
[第 三 纪 / 第 三 紀, dì sān jìㄉㄧˋ ㄙㄢ ㄐㄧˋ] third period; tertiary (geological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago) #71192
元古代
[元 古 代, Yuán gǔ dàiㄩㄢˊ ㄍㄨˇ ㄉㄞˋ] Proterozoic (geological era 2500-540m years ago) #84050
太古代
[太 古 代, Tài gǔ dàiㄊㄞˋ ㄍㄨˇ ㄉㄞˋ] Archaeozoic (geological era before 2500m years ago) #116859
震旦纪
[震 旦 纪 / 震 旦 紀, zhèn dàn jìㄓㄣˋ ㄉㄢˋ ㄐㄧˋ] Sinian (c. 800-542 million years ago), late phase of pre-Cambrian geological era #125442
埃迪卡拉
[埃 迪 卡 拉, Āi dí kǎ lāㄞ ㄉㄧˊ ㄎㄚˇ ㄌㄚ] Ediacaran (c. 635-542 million years ago), late phase of pre-Cambrian geological era
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