They had been able to look at some of the bones in the 1990s and could see two arched nasal crests, The Associated Press reported.
The fossil is in the family tree of the Gryposaurus or duck-billed dinosaurs but experts said it was a primitive species in the line and could show the evolution of the duck-billed dinosaurs.
Their conclusion of where it came in the line was based on an odd lower jaw, according to the AP.
The fossils are being examined at the University of Texas at Austin. They came from Big Bend National Park, the AP reported.
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