Mystery Jawbone

[GPayton]

Found on the Brazos River just southwest of Houston. When I first saw it I almost left it behind as it looked modern at a glance. The jawbone is definitely mineralized, however, but unfortunately its missing the teeth it used to contain as it's only one side of the whole bone. My best guess is that its a fragment of an alligator jaw based on the round tooth cavities and the way they're spaced apart, but if anyone more knowledgable then me could give a suggestion, that would be great.