Tooth or Coral? Holderness Coast

[StormDancer]

We had a trip to the Holderness.WeI usually only collect Ammonites and the odd bit of bone. The Holderness coast has lots of different corals that come from the boulder clay and if our bag is empty we may take a bit of coral for the garden  Anyhow... I found this, at 1st I though tooth, then thought horn coral and discarded it, walked away a few paces, turned round walked back and picked it up again! Though maybe its a tooth, maybe its a coral.... LOL this has gone on for days!!! So over to the experts. I have only ever found teeth as part of a ichthyosaur Jaw, so actually have no idea what a single tooth should look like. 

[StormDancer]

[TqB]

Definitely a Carboniferous solitary rugose coral ("horn coral").

[StormDancer]

58 minutes ago, TqB said:

Definitely a Carboniferous solitary rugose coral ("horn coral").

That's what I 1st though, however the only other horn corals I have are Silurian, Wenlock series, and quite different,  which made me question. Thanks for the clarification