古生代GǔshēngdàiTop 45000Meanings1. Paleozoic, geological era 545-250m years ago, covering Cambrian 寒武纪, Ordovician 奥陶纪, Silurian 志留纪, Devonian 泥盆纪, Carboniferous 石炭纪, Permian 二叠纪Characters used古ancient生birth代to replace