The human images were found in 2001 by Pietro Gaietto on an expedition through the Borzonasca district of Italy. He claims the rock has been sculpted into faces that look in opposite directions; one is bearded with what Gaietto calls an "expressive face". If this is genuine, the artist would have been an extinct human species that died out about 150,000 years ago.
http://news.bbc.co.uk/2/hi/science/nature/3197402.stm
