Science. 1976 Jul 2;193(4247):47-9. doi: 10.1126/science.193.4247.47.
Evidence from Precambrian sediments appears to indicate that nucleated (eukaryotic) organisms had become well established and relatively diverse about 850 +/- 100 million years ago and that eukaryotes were probably extant, and may have first appeared, as early as 1400 +/- 100 million years ago.
来自前寒武纪沉积物的证据似乎表明,有核(真核)生物大约在 8.5 亿至 1 亿年前已经很好地确立并相对多样化,而且真核生物可能很早就存在了,可能最早出现在 14 亿至 1 亿年前。