TABLE 1. Geographic and lithostratigraphic data of samples of hadrosaur teeth used in this study.

	Taxon	Institution	Site Location	Rock unit
	Edmontosaurus	Museum of Nature and Science	Alaska	Prince Creek Fm.
	Edmontosaurus	Museum of Nature and Science	Wyoming	Lance Fm.
	Hadrosauridae	Texas Natural Science Center	Alberta	Oldman Fm
	Hadrosauridae	Texas Natural Science Center	Texas	Aguja Fm.
	Hadrosauridae	Texas Natural Science Center	Texas	Javelina Fm.
	Hadrosauridae	Denver Museum of Nature and Science	Wyoming	Lance Fm.