Artwork first found on rocks in Europe and Africa, created with charcoal, lime, and iron oxide of various colors mixed with animal fat or marrow. European paintings are in caves and date back to early Aurignacian times 70,000-80,000 BC; if created purely for art, though, they would not have been done in the depths of the cave. It is thought that they must have been of religious, magical, or ritual significance. There is proof that schools of painting were held in some caves. Polychrome paintings were made at the peak of Palaeolithic Art, mid-Magdalenian times, about 10,000 BC.