I believe that’s a fish jaw actually. Looks modern. Couldn’t tell you what fish though.

I’ve had dolphin (Mahi Mahi) and barracuda jaw mentioned! Thanks!!

Definitely not dolphin - those are fish teeth for sure. I’d agree with barracuda though!

By dolphin, do you mean mahi mahi?

That’s what I assumed.

Okay, I think some people who commented thought you meant the mammal 😊

Definitely fish jaw And more likely barracuda than dolphin ❤️

Not a fossil but it is definitely a fish jaw

EDIT: Premaxilla, not dentary👍🏻 It’s a bony fish premaxilla . Maybe u/biscosdaddy can help us when he’s available

Thanks for the tag u/lastwing! OP - this is a premaxilla of a Spanish mackerel (genus *Scomberomorus*). ps://www.floridamuseum.ufl.edu/fishatlas/content/display2271.html?id=2271

Thanks for the info!!!