Larson, you probably saw me post that before on here. I have speculated for years that they may have small effigies of the mounds they created. I have also heard that they may have put over the eyes of the dead during a ceremony, yet I've never heard of any being found in a grave like that.
That is one very nice looking Cone. Very rare artifacts. I have only found 10 in my 45 years of hunting.