11 marzo 2015
A new intensive survey of the Messak Settafet escarpment, a massive outcrop of sandstone in the middle of the Saharan desert, has shown that stone tools occur «ubiquitously» across the entire landscape: averaging 75 artefacts per square meter, or 75 million per square kilometer.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/JfWiy875gUk/150311160254.htm
