WAS THERE A SOUTHEASTERN DINOSAUR PROVINCE IN THE LATE CRETACEOUS?
Nevertheless, enough Appalachian dinosaur material has been identified to see some evidence of North Atlantic-Southeastern provincial distinction. Among distinctions, The Upper Cretaceous southeastern assemblage (including North and South Carolina and Gulf Coast sites) includes the tyrannosauroid Appalachiosaurus, abundant dromaeosaurs (especially the velociraptorine Saurornitholestes), nodosaurs, and a newly reported neoceratopsian. The northern assemblage (New Jersey to Maryland) includes the tyrannosauroid Dryptosaurus, the only reported lambeosaurine hadrosaur, and only anecdotal reports of smaller theropods. Given the sparse dinosaur record in Appalachia, even with more than 150 years of extensive collecting, it is possible that these differences are artifacts of age, exposure and preservation. Nevertheless, one logical explanation for provinciality is that the point of entry from Laramida (western North America) to Appalachia may have been a southern land extension or archipelago across the Interior Seaway, thus favoring earlier migration into the proximal Gulf Coast.