folds back under itself. This unique crest allows it to be distinguished from similar hadrosaurs, like Gryposaurus. The top of the crest is roughened, and the maximum preserved length of the skull is ~90 centimeters (~35 in). According to Gregory S. Paul, it was about 7.5 meters long and weigh up to 2500 kg. Classification Anasazisaurus is a saurolophine hadrosaurid, meaning it lacked a hollow crest. The most recent review recognized it as distinct, but did not try to place it beyond Hadrosaurinae. Paleoecology and paleobiology Anasazisaurus was discovered in the Farmington Member of the Kirtland Formation, which is one of the lower members. This formation dates from the late Campanian stages of the Late Cretaceous Period (73-74 million years ago), and is also the source of several other dinosaurs, like Bistahieversor, Kritosaurus, Naashoibitosaurus, Parasaurolophus, Pentaceratops, Nodocephalosaurus, Saurornitholestes, and Ziapelta. As a hadrosaurid, Anasazisaurus would have been a large bipedal/quadrupedal herbivore, eating plants with a sophisticated skull that permitted a grinding motion analogous to chewing. Its teeth were continually replacing and packed into dental batteries that contained hundreds of teeth, only a relative handful of which were in use at any time. Plant material would have been cropped by its beak, and held in the jaws by a muscular cheek. Feeding would have been from the ground up to ~4 meters (13 ft) above. See also Timeline of hadrosaur research References Saurolophines Late Cretaceous dinosaurs of North America Natural history of San Juan County, New Mexico Taxa named by Spencer G. Lucas Fossil taxa described in 1993 Paleontology in New Mexico Campanian genus first appearances Campanian genus extinctions Ornithischian genera