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Re: Pachyrhinosaur nasal horn?

----- Original Message -----
From: "Williams, Tim" <TiJaWi@agron.iastate.edu>

> Perhaps a cornified nasal
> horn held certain advantages over a horn with a bony core.

Maybe keratin is cheaper to maintain than bone. Of course this would beg the
question why not all centrosaurines had pure keratin horns...