I think it's a bivalve, but which one?

[Denis Arcand]

I know there aren't many details for a formal identification, but even a guess would be fine

 

I found it in the Nicolet River formation (Late Ordovician)

 

[Fossildude19]

Cropped and rotated:

 

 

 

@FossilDAWG may have some ideas...

[Denis Arcand]

Hi @Tidgy's Dad can you help me ID this one ?

[Tidgy's Dad]

I'm not too hot on bivalves, but i do have a few species from the Ordovician of Canada. 

You can see ribbing in the section where it is broken, I think, so this would perhaps be a species of Ambonychia? 

[FossilDAWG]

I think it may be a Ctenodonta.

 

Don