Definitely a brachiopod, phylum Brachiopoda, superfamily Spiriferoidea. It
looks like a member of Terebratulida, but if it's from the north it has to
be Paleozoic. I guess the only way to really tell is to grind it down on a
diamond lap & see if the lophophore (shelly support for the filtering
apparatus) is a terebratulid loop or a spiriferoid double-cone spiral.
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