I'm curious (read "doubtful") about the claims for reliably detecting DNA and proteins in soils that are 100K+ years old. For medical diagnostics, we even had

I'm curious (read "doubtful") about the claims for reliably detecting DNA and proteins in soils that are 100K+ years old. For medical diagnostics, we even had trouble with small samples of blood directly and reliably obtained and stored. For sandy soils, it's hard to imagine layers remain distinct given the porosity. Wet soils would invite all sorts of other life. The article lists no papers. The lead "Dr Robert Dinnis" is listed as an "honorary" (i.e., not active) research fellow at the University of Aberdeen. It's fun to think about, though.