> DNA has a half life of ~500 years but: Researchers in 2016 measured chloroplast DNA in marine sediment cores, and found diatom DNA dating back to 1.4 millio

> DNA has a half life of ~500 years but: Researchers in 2016 measured chloroplast DNA in marine sediment cores, and found diatom DNA dating back to 1.4 million years.[62] This DNA had a half-life significantly longer than previous research, of up to 15,000 years. Kirkpatrick's team also found that DNA only decayed along a half-life rate until about 100 thousand years, at which point it followed a slower, power-law decay rate. https://en.wikipedia.org/wiki/Ancient_DNA#Non-human_aDNA https://en.wikipedia.org/wiki/Ancient_DNA#Non-human_aDNA