Potomac River tooth question

[cck]

I picked up this tooth yesterday on the Potomac (mostly Miocene deposits) - I can’t place it... it does have some damage to the root. I at first thought Tiger, but the little serrations are on the wrong side of the curve... Any ideas? Thanks!

[Al Dente]

Looks like Notorhynchus.

[cck]

Ah I see that now! With the cusp on the right broken off... Thanks!

[PaleoNoel]

It could be a worn Physogaleus contortus (a tiger shark relative), they are more common than the sixgill sharks but the latter isn't out of the question.

[cck]

That was my initial thought as well, but the  tigers have their serrations inside the tooth curve I think?