Unknown selachians from New Mexico's Coniacian Take 9

[readinghiker]

The first is a strange tooth whose crown extends far into the root. As you can see on the photos, there is a bulge at the bottom of the crown, and that the root extends up the sides of the crown quite a ways. Any ideas?

[siteseer]

That might be a posterior tooth of Cretoxyrhina.

[fossilsonwheels]

+1 for possible Cretoxyrhina