These four horses occupy a small recess in the Chauvet Cave. They bare similar artistic attributes. The artist used fingers to mix and spread a charcoal paste and applied it in order to emphasize the main outlines and give relief and shading to the heads. Notice another figure drawn subsequently, that of a large lion drawn facing to the right [its hindquarters and tail are clearly visible], but without interrupting the lines of the earlier horses [except the lower horse]. http://www.bradshawfoundation.com/chauvet/facing_horses.php
The Aurignacian period (40,000 to 28,000 years ago) is an Upper Paleolithic stone tool tradition.