Substantial changes consist in the transfer of Wutaian into Archaean and the alteration of lower limit of Changchengian system from 1850 to 1700 Ma, both based on new interpretation of isotopic dating.
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释义
划分中的重要改变是根据新的年龄值数据将五台群归入太古代,将长城系底界改为1700Ma;
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