CRETACEOUS TETRAPOD FOOTPRINT BIOSTRATIGRAPHY, BIOCHRONOLOGY, AND ICHNOFACIES

摘要: The global record of Cretaceous tetrapod footprints is dominated by the tracks non-avian dinosaurs and birds; fewer are known pterosaurs, crocodylians, turtles, mammals, other tetrapods. track best from East Asia (especially China Korea) western North America. A moderately extensive also South America (primarily Argentina Brazil), but assemblages Europe, Africa, Australia much more poorly known. Here, we re-examine two footprint biochrons based on record. An Early biochron characterized sauropod ornithopod tracks. Late has adds hadrosaurs, tyrannosaurids,