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gnaw marks?

You wrote: 
>On 30 Aug 97 at 21:37, jamolnar@juno.com wrote:
>> > Predators can, if their digestive systems are strong enough,
>> > get calcium from the hard bits of their prey; but where
>> > exactly do herbivores get their calcium?
>> Many herbivores chew on bones and antlers that they find of dead
>> animals out in the wild.  Any skulls, turtles shells, bones left out
>> in the wild have plenty of chew marks on them from this gnawing,
>> especially from rodents.
>Mmm, just a question: Would these "plenty of chew marks" show up on 
>fossils? Is there evidence of this gnawing by herbivores on 
>fossilised bones from the mesozoic?

When I was up at Dinosaur Provincal Park, years ago, some one brought 
up a bone with several small 'chew marks' on it. Clive (I think), said 
it was gnaw marks of a small mammal. I don't know if anyone has written 
this up 
or if it really was gnaw marks, but it sure looked like it.