Uranium-235 which has a half-life of 713 million years will best suited in dating a fossil from Precambrian time.
Thi8s is defined as a trace of an animal or plant of a past geologic age that has been preserved in Earth's crust.
The Precambrian time occurred around 4.6 billions years ago and Uranium-235 which having a half-life of 713 million years means it's more useful when compared to carbon-14 which has a half life of 5,370 years.
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