What is this cephalopod?

[Bringing Fossils to Life]

Almost a year and a half ago, on my trip to Montour fossil pit, (and my first serious fossil hunt), I found a cephalopod, though not in shale. It was in some introduced gravel, and I immediately identified it as Michelinoceras - it has been my favorite animal for a really long time and I was very biassed. Later, because of the close septa, I thought it was spyroceras; then, since it didn't have annulations, orthoceratoidea indet. . After seeing some Treptoceras, then Cameroceras and Endoceras, I wondered if it were Treptoceras - the rock it is in I cannot identify. What is this cephalopod?

[Fossildude19]

Without origin information for the rock, this could be an impossible ID.