It's always fun to find a skull! Did he identify it himself?
Grendel, that pic is a little too little to view and it won't enlarge.
I used to find shark teeth all the time when I was a park ranger in Monmouth county. There were tons in this one section of a small neglected stream. I will find some of them and compare and report back soon. I'm pretty sure that is what it is (if not the Jersey Devil)
Jeff