This is the original painting created for the cover of the science fiction novel by Philip José Farmer - about a team of 21st-century scientists who travel to 12,000 BC to study prehistoric humans,  set within Farmer's interconnected "Wold Newton" universe.  Published by Ballantine in paperback, revised edition 1977.   Marvelous imagery in Acrylics on Upson board, 24" x 16"  and signed