ID on a vertebra? in a fossil plate.

[Porcoa]

A river find from NE Oklahoma. Any info is appreciated! 

[JohnBrewer]

That's a busy plate. Can help but welcome to the forum

[abyssunder]

I see lots of crinoid stems and maybe brachiopod/bivalve, coral, gastropod remains,  in the matrix, so I think there is no vertebrate material, although it could be not excluded.

[Porcoa]

2 minutes ago, abyssunder said:

I see lots of crinoid stems and maybe brachiopod/bivalve, coral, gastropod remains,  in the matrix, so I think there is no vertebrate material, although it could be not excluded.

 

What do you think the one I measured could be?

[abyssunder]

It will be difficult to say due to its recristallized character and because it is embedded in the matrix, but I think it could be a brachiopod or gastropod in somehow oblique section in that agglomerate seabed sediment.

[abyssunder]

The variety of forms could be large. For example I can see a far resemblance between the pictures below, putting aside the geological time. (Probably I'm wrong and it's a trick gained by my visual memory trying to find the possible match.)

 

picture from here