It' amazing the amount of historical stuff we find, if we don't know what the cone shaped thingy is for, just imagine those down the track through time doing research on this very forum(armchair time travellers) trying to work out what they are and why they were found where they were and just what they were used for will be such a mystery for them,... I don't know, I couldn't even begin to postulate on it,... maybe it's a part for something( he says as he shrugs his shoulders unknowingly) of which we are totally unaware.