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Jurassic Gnawing Mammals

Does anyone know whether or not the gnawing animal niche was filled during
 the Early Mesozoic?  I know that the multi's were in force during the
 Cretaceous, but is there any evidence for a predicessor (sp) gnawing
 mammal/animal?  More importantly, if there was no gnawing-mammal
 equivalent, then would the chances of a single bone becoming fossilized be
 much greater for the Early Mesozoic?

With Laughter,

"It's only a model."