Studying the evolution and biogeographic distribution of dinosaurs during the latest Cretaceous is critical for better understanding the end-Cretaceous extinction event that killed off all non-avian dinosaurs. Western North America contains among the best records of Late Cretaceous terrestrial vertebrates in the world. but is biased against small-bodied dinosaurs. Isolated teeth are t... https://danddcollectiblers.shop/product-category/pens/