"Some time between 10,000 and 11,000 years ago, a group of Paleoindian hunters gathered in the late summer or early fall in the Beaver River floodplain in Harper County...They prepared a red ochre paint from local stone rich in the blood-red mineral, iron. They then painted a powerful symbol on the bison skull and placed it at the head of the gully where it could draw another herd of bison up to the waiting hunters. The plan and the ritual succeeded. As many as 30-35 bison were killed...
That skull, the oldest painted object ever found in North America, is now on exhibit at the Sam Noble Oklahoma Museum of Natural History."
And what was that symbol?