Tassili-n-Ajjer, the famous rock art site of the Central Sahara has been dated to 9-10 millennia ago or older, using OSL techniques.
Sources[fr]: Pileta, Hominides.com.
Academic ref. (PPV): Norbert Mercier, Jean-Loïc Le Quellec et al., OSL dating of quaternar y deposits associated with the parietal art of the Tassili-n-Ajjer plateau (Central Sahara), Quaternary Geochronolog y (2012), doi:10.1016/ j.quageo.2011.11.010
Note to readers: I am going to attempt to at least limit posts that deal with too many unrelated issues. So expect more of these shorter snippets. I hope is best for all.