There was this, recently: http://www.sciencemag.org/news/2017/04/no-bones-no-problem-dna-left-cave-soils-can-reveal-ancient-human-occupants http://www.sciencema

There was this, recently: http://www.sciencemag.org/news/2017/04/no-bones-no-problem-dna-left-cave-soils-can-reveal-ancient-human-occupants http://www.sciencemag.org/news/2017/04/no-bones-no-problem-d... That's only 50,000 years, though. Also, no idea what the quality of the DNA is at that point.