Not necessarily NA Indian artifacts but I found these two old gals on the Neosho River near Oswego, Kansas while scouring my gravelbars for chert,! The water dropped quite a bit on Christmas eve, revealing these ghosts.
Super find and GREAT MOUNTED DISPLY'S ! Just this passed Fall I found a complete White Tailed Deer skeleton , a 4 pointer ! I kept the skull and I think I'll mount it in a similar display as yours's ! Nice find !