 In 1904 , Barnum Brown discovered the type specimen ( AMNH <unk> ) of Kritosaurus near the Ojo Alamo Formation , San Juan County , New Mexico , United States , while following up on a previous expedition . He initially could not definitely correlate the stratigraphy , but by 1916 was able to establish it as from what is now known as the late Campanian @-@ age De @-@ na @-@ zin Member of the Kirtland Formation . When discovered , much of the front of the skull had either eroded or fragmented , and Brown reconstructed this portion after what is now called Edmontosaurus , leaving out many fragments . However , he had noticed that something was different about the fragments , but ascribed the differences to crushing . He initially wanted to name it <unk> , but found out that this name was already in use ; Jan <unk> , who had visited Brown before the change , inadvertently leaked the previous choice . He kept the species name , though , leading to the combination K. navajovius . 
