Red Zigzag on a Bison Skull

   "Dr. Lee Bement recounts the mysterious story behind unearthing the Cooper Skull in 1994. This bison skull is the oldest painted object ever found in North America...
   The skull was taken to a lab, where the red hematite paint radiocarbon dated to roughly 10,500 years ago. That makes the Cooper skull the oldest painted object ever discovered in North America. The image below represents where a Folsom hunter or perhaps a shaman painted several designs. Only the lightning bolt was visible to the naked eye. The story doesn't end there, however..."
http://www.pbs.org/time-team/explore-the-sites/bones-badger-hole/cooper-skull/