Possible Mosasaur tooth

[Benjamin Van Ee <bnjmnvn@xxxxxxxxx>]

Is there a person who could help me with identifying a "tooth."
You can see some pictures of it at:
http://www.dordt.edu/dept/biology/pictrev.shtml
I found it on a recent Paleontology class field trip south of Hawarden
in NW Iowa.  It might be of a Mosasaur.  It looks similar to the illustration
of a Mosasaur tooth found by Leidy and figured on plate 2 of Ludvigson
et al in Iowa Gelogical Survey Guidebook Series #4 of 1981.
It most likely came from Greenhorn limestone but due to errosion it
could be from the underlying Granerous shale.
This is the first such "tooth" we have found in the local Cretaceous
and not being experts wonder if there are other teeth that might look
very similar to those of Mosasaurs.  Is there a good reference for
these teeth?  Witzke seems to imply in his article in the Survery Guidebook
that Mosasaur fossils are rare in this area; is that still thought
to be the case?

Benjamin Van Ee
Dordt College
498 4th Ave. NE
Sioux Center, IA  51250

email: bnjmnvn@dordt.edu
phone: (712) 722 6616