Dipleura dekayi pygidium

@Dean Ruocco @NickG somewhat embarrassingly I cannot tell if this is a bivalve, a brachiopod (or a fragment of either), or a Dipleura pygidium? It has a texture that reminds me of Dipleura but my other example does not have the concentric lines. Any ideas?

look up discinid brachiopods

I think it is actually a Dipleura pygidium, looks very similar to this:

+1 for Dipleura pygidium.

4 minutes ago, Fossildude19 said:

+1 for Dipleura pygidium.

Thank you  would you mind adjusting the title of this one to Dipleura dekayi?

1 hour ago, NickG said:

look up discinid brachiopods

These sound very cool though, love anything with different biochemistry

I vote Dipleura pygidum too.