Shark tooth or something else?

[Dnicewave]

Is this a shark tooth stuck in a rock or a tooth from something else still connected to part of the jaw bone? 

[Fin Lover]

Looks like one end of the root with a cusp or bit of the crown.  There might be some bourlette showing in the last picture.

 

Edited 2 hours ago by Fin Lover

[Fin Lover]

Don't judge my drawing skills (or lack thereof), but something like this:

Edited 2 hours ago by Fin Lover