 Aetosaur fossils have been found on all continents except Australia and Antarctica , giving them a nearly worldwide distribution during the Late Triassic . Many aetosaur remains have been found from the Chinle Group in the southwestern United States . Most fossils have been found from Arizona , New Mexico , and Texas . Some remains have also been found from Utah , particularly in Canyonlands National Park and Zion National Park . Aetosaurs are also known from the Newark Supergroup along the East Coast of the United States in states such as Connecticut and North Carolina . Two genera are known from Greenland : Aetosaurus and Paratypothorax . They have been found from the Fleming Fjord Formation in Jameson Land . Longosuchus is the only aetosaur known from Africa , with scutes having been found from the late Carnian <unk> Formation in Morocco . During the Late Triassic , Morocco would have been in close proximity with the Newark Supergroup of North America in the supercontinent of Pangaea . It is also possible that Desmatosuchus was present in Africa , as fossils have been found from the <unk> Series in Algeria that were referred to the genus . 
