GIN: 0cm 0cm 0pt" class=MsoNormal>g=EN-US New ?Times Roman?,?serif?;’>The global record of Cretaceous tetrapod footprints is dominated by the tracks of non-avian dinosaurs and birds; fewer tracks are known of pterosaurs, crocodylians, turtles, mammals, and other tetrapods. In this paper, the autors re-examine two global footprint biochrons based on the Cretaceous tetrapod footprint record. An Early Cretaceous biochron is characterized by sauropod and ornithopod tracks. A Late Cretaceous biochron has fewer sauropod tracks but adds the tracks of hadrosaurs, tyrannosaurids, and ceratopsians. Furthermore, the Cretaceous footprint record documents many important biostratigraphic data points, such as the mid-Cretaceous extirpation of sauropod dinosaurs in North America and the terminal Cretaceous extinction of dinosaurs.