I'm not an expert in this area but I do know a fair amount on the subject. I believe the section you linked is out of date. The DNA we get back from old situa

I'm not an expert in this area but I do know a fair amount on the subject. I believe the section you linked is out of date. The DNA we get back from old situations typically was preserved, by dryness/freezing, and it's still quite fragmentary. The actual "half life" of DNA is not that interesting- its the details of the DNA remnants that matter.