WoW thanx for all the kind words ya'll...I have seen them in books,and have heard of THAT GUY who found one digging right where you are now..kinda thing,but never expected to find one..So I guess I am that guy now..lol
I can't be of any help with the use part.Alot of folks have alot of theorys on drill use,and corner tang hafting.And is a thread in it's self.
I.M.O. The tang was used for attaching a leather carrying thong,The drill....huh....Punch, buttin,hair pin,marrow gettin at tool?I think they all could be right.