Ammonoidea

And then any thoughts on this one? @Bringing Fossils to Life

The shape of the suture proves this ammonoid to be a Tornoceras; most ammonoids at that site are. I have not been there, but my friend has and has numerous ammonoids.

I made a guide to Middle Devonian ammonoids from the region a while ago; it was specifically for the Mahantango Formation, which Seven Stars is a part of. Koenenites may not be correct; the fossils may instead be Agoniatites.