By the late Maastrichtian, albertosaurines appear to have gone extinct, while the tyrannosaurine "Tyrannosaurus" roamed from Saskatchewan to Texas. This pattern is mirrored in other North American dinosaur taxa. During the Campanian and early Maastrichtian, lambeosaurine hadrosaurs and centrosaurine ceratopsians are common in the northwest, while hadrosaurines and chasmosaurines were more common to the south. By the end of the Cretaceous, centrosaurines are unknown and lambeosaurines are rare, while hadrosaurines and chasmosaurines were common throughout the Western Interior. A study published in the journal "Scientific Reports" on February 2, 2016 by Steve Brusatte, Thomas Carr "et al". indicates that during the later Maastrichtian, "Tyrannosaurus" itself might have been partially responsible for the extinction of the other tyrannosaurids in most of western North America. The study indicates that "Tyrannosaurus" might have been an immigrant from Asia as opposed to having evolved in North America (possibly a descendant of the closely related "Tarbosaurus") that supplanted and outcompeted other tyrannosaurids. This theory is further supported by the fact that few to no other types of tyrannosaurid are found within "Tyrannosaurus"' known range.