creodont?

I found this when I was first getting into serious fossil collecting, about 4 years ago. I knew it was something interesting, but I was total noob. Finally this year I got around to trying to figure out what it was from. The best guess of the New Jersey State Museum is that it is likely a premolar from a Creodont, possibly something like Hyaenodon. If anyone could provide a better ID or their opinions, please contact me. The literature believes the best estimate for age of the deposit that this came from is early to mid Miocene, but early miocene, about 21mya is my best guesstimate.