By the known data of isotope age determination, Nanhuaian time-structure frame was principally set up with the top boundary about 700 Ma and bottom about 800 Ma.

• 综合已有同位素测年数据，初步建立起南华纪年代构造格架，确立南华纪底界年龄为800 Ma左右，顶界年龄为700 Ma左右。