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延展纪

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延展纪（Ectasian，符号MP2）是地质时代中的一个纪，开始于同位素年龄1400±0百万年(Ma)，结束于1200±0Ma。

延展纪期间出现有性生殖。

延展纪属于前寒武纪元古宙中元古代；延展纪的上一纪为盖层纪，下一纪为狭带纪。

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延展纪
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