How Old Are the Eukaryotes?

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Science  02 Jul 1976:
Vol. 193, Issue 4247, pp. 47-49
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.