not sure if we should dig or call in experts

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I don't know, but I have this to say: Awesome. I'd call in an expert, at least to have a look.

Is this a tail? I really doubt that.....

Can you please tell us some more about the sediment this was found in? From the looks it is a marine limestone.

This "tail" is fairly huge, but looks suspiciously like a cephalopod. Maybe an Orthoceras or a close relative? Sizes of 2m are not too uncommon for some genera.

My guess is similar to Heinrich's, that it's probably a cephalopod.  However, it's still an awesome, large cephalopod.  Local museums would probably be very interested, and you should certainly get in touch with local experts.