NJ tooth fragments (?)

[LoreHunter]

Hi all

 

This past weekend, we took a quick trip up to Big Brook, NJ and found these small, very worn fragments of what I suspect may be teeth of some kind 

 

I have a guess or two as to what they may be from looking around online, but I don't have much experience with anything besides shark teeth, so I was hoping for a bit of help clarifying

 

Any ideas? 

[pachy-pleuro-whatnot-odon]

I'd say the brown specimen looks like a reptile tooth - either mosasaur or crocodile, but hard to say which - whereas the black tooth has carinae, and therefore looks like a fish tooth to me, probably Enchodus, but could be Xiphactinus. @Fossildude19?

[LoreHunter]

Thanks for the info!