| 侏罗纪 | [Zhū luō jì, ㄓㄨ ㄌㄨㄛ ㄐㄧˋ, 侏 罗 纪 / 侏 羅 紀] Jurassic (geological period 205-140m years ago) #47,203 [Add to Longdo] |
| 古生代 | [Gǔ shēng dài, ㄍㄨˇ ㄕㄥ ㄉㄞˋ, 古 生 代] 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 #60,350 [Add to Longdo] |
| 二叠纪 | [Èr dié jì, ㄦˋ ㄉㄧㄝˊ ㄐㄧˋ, 二 叠 纪 / 二 疊 紀] Permian (geological period 292-250m years ago) #81,793 [Add to Longdo] |
| 元古代 | [Yuán gǔ dài, ㄩㄢˊ ㄍㄨˇ ㄉㄞˋ, 元 古 代] Proterozoic (geological era 2500-540m years ago) #84,050 [Add to Longdo] |
| 奥陶纪 | [Ào táo jì, ㄠˋ ㄊㄠˊ ㄐㄧˋ, 奥 陶 纪 / 奧 陶 紀] Ordovician (geological period 495-440m years ago) #109,545 [Add to Longdo] |
| 太古代 | [Tài gǔ dài, ㄊㄞˋ ㄍㄨˇ ㄉㄞˋ, 太 古 代] Archaeozoic (geological era before 2500m years ago) #116,859 [Add to Longdo] |
| 太古宙 | [Tài gǔ zhòu, ㄊㄞˋ ㄍㄨˇ ㄓㄡˋ, 太 古 宙] Archaean (geological eon before 2500m years ago) #132,937 [Add to Longdo] |
| 显生宙 | [Xiǎn shēng zhòu, ㄒㄧㄢˇ ㄕㄥ ㄓㄡˋ, 显 生 宙 / 顯 生 宙] Phanerozoic (geological eon lasting since the Cambrian 武紀|寒武纪, c. 540m year ago #203,263 [Add to Longdo] |
| 二迭纪 | [èr dié jì, ㄦˋ ㄉㄧㄝˊ ㄐㄧˋ, 二 迭 纪 / 二 迭 紀] Permian (geological period 292-250m years ago); also written 二疊紀|二叠纪 [Add to Longdo] |
| 前寒武纪 | [Qián Hán wǔ jì, ㄑㄧㄢˊ ㄏㄢˊ ㄨˇ ㄐㄧˋ, 前 寒 武 纪 / 前 寒 武 紀] pre-Cambrian (geological period before c. 540m years ago) [Add to Longdo] |