Mosasaur predation marks

[hadrosauridae]

Today I was cleaning the baculites found on the last fossil trip, and found one VERY cool one.  This segment looks to have clear and deep tooth holes in it.  It is believed that mosasaurs fed on baculites, and the hole sizes would certainly agree with that.

 

[JohnJ]

I'm skeptical.  Was this an old mosasaur, missing some teeth, and unable to crunch through this size baculites?  

[Jared C]

hmmm - think you can get a photo with flash of the bottom of the pits? 

 

Texas A&M barely has fossil collections worth mentioning - but on display is an ammonite with rather convincing mosasaur bite marks on it, so it is possible. But - I agree with John that this would be an unusual bite with only two tooth holes on the entire vertical. 

[Al Dente]

7 hours ago, hadrosauridae said:

This segment looks to have clear and deep tooth holes in it.  It is believed that mosasaurs fed on baculites, and the hole sizes would certainly agree with that.

Your fossil is a steinkern of an ammonite. The two holes are in the infilling sediment, not the original shell. Why would a mosasaur bite a mud filled Baculites shell?