Wow, thanks! Great addition! Do you mean Cahokia?
The teeth of one of the clubs at Cahokia were from a Great White Shark so must have been brought or traded in... the wood and teeth and effigy teeth were found in Mound 34 which lies on the east side of the largest mound, Monks’ Mound. Mound 34 dates to 1200AD. There were teeth from two types of sharks found in the Cahokia area, the other type was probably bull shark. Cahokia was already known for the odd curved teeth effigies but I think until the archeologist Perino found the wood [black walnut, IIRC] and teeth together no one knew what the curved effigy teeth were for.