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古生代
Gǔshēngdài
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]]
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