Although identification of Hadrosaurid teeth in North America is very difficult or impossible some older publications by John Horner give us some information to help us with a few.  The information goes back a bit so there might be some new understanding but will share what is published.   If anyone has publications that can add to the dentary information of teeth from North America please feel free to post it.   Horner notes that on dentary teeth all Saurolophinae teeth have diamond-s