古元古代地层缺乏种类繁多的标准化石，这使大区域性的、全球性的地层对比难以实现。
Palaeoproterozoic formation lacks variety of standard fossils, thus it become difficult to compare the whole world formations or large .
古元古代地层缺乏种类繁多的标准化石，这使大区域性的、全球性的地层对比难以实现。
Palaeoproterozoic formation lacks variety of standard fossils, thus it become difficult to compare the whole world formations or large .
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