Prominent among these forms is Tanystropheus longobardicus

Length 94mm

limbs modified into flippers

This reptile had an unusual appearance compared to the better-known dinosaurs

Lythronax argestes Mammuthus Prominent among these forms isLythronax argestes was a carnivorous theropod dinosaur of the Tyrannosauridae group that lived during the Late Cretaceous , in the early middle Campanian (approximately 8079 million years ago) . Its remains come from the Wahweap Formation , in what is now southern Utah (United States) , within the ancient island continent of Laramidia , and its discovery has been key to understanding the origin and early diversification of tyrannosaurids in North