repost: possible mosasaur tooth

[Benjamin Van Ee <bnjmnvn@xxxxxxxxx>]

Pardon me for reposting this, several subscribers that I know did not
receive the text body.

Is there a person who could help me identify a "tooth."  You can see
a picture 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 may be a Mosasaur.  It looks similar to the illustration
of a Mosasaur tooth found by Leidy and figured on plate 2 of Witzke's
article in Iowa Geological Survey Guidebook Series Number 4 of 1981.
It most likely came from Greenhorn limestone but due to errosion it
could be from the underlying Graneros 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 Survey 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