When I first said the half-life of DNA is ~521 years at 13.1°C I was careful to include that temperature which made it clear that the decay of any organic mater

When I first said the half-life of DNA is ~521 years at 13.1°C I was careful to include that temperature which made it clear that the decay of any organic material over time has more variables than merely time. Here's the article where that number comes from. https://royalsocietypublishing.org/doi/full/10.1098/rspb.2012.1745 https://royalsocietypublishing.org/doi/full/10.1098/rspb.201... Mammoth DNA preserved in permafrost can last longer. Temperature is a variable. But dinosaurs lived in a very warm time, much warmer than the Ice Age the mammoths lived in so there's no possibility of nature somehow preserving Jurassic fossils in ice/permafrost.