Permian:
The Permian is a geologic period and system which extends from Permian to Triassic million years ago.
en.wikipedia.org
二叠纪:
二叠纪（Permian）是约2.9～2.5亿年前古生代的最后一个地质时代，在石炭紀、三叠紀之間。
zh.wikipedia.org
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Permian二叠纪