http://www.cam.ac.uk/research/news/saharan-carpet-of-tools-is-the-earliest-known-man-made-landscape http://www.cam.ac.uk/research/news/saharan-carpet-of-tools-i

http://www.cam.ac.uk/research/news/saharan-carpet-of-tools-is-the-earliest-known-man-made-landscape http://www.cam.ac.uk/research/news/saharan-carpet-of-tools-i... The source I believe.