Here is a recent news article about the age of the art on the walls of the Chauvet cave. A recent study used cave bear remains as a point of reference to support the approximately 30,000 year old date for the cave art.
http://www.newscientist.com/article/mg2 ... e-art.html
http://www.newscientist.com/article/mg21028093.900-bear-dna-is-clue-to-age-of-chauvet-cave-art.html