Arizona Through Time
Triassic Petrified Forest and Wetlands
Postosuchus (left), a carnivore, confronts Placerias, a
herbivore in the Late Triassic forest of Arizona, 225 million years ago.
These animals lived in the forests that today we know as the “petrified
forest” of northern Arizona.
Buettneria was a large amphibian that lived in the wetlands
adjacent to what are now the petrified forests. A lie-in-wait predator,
Buettneria lived in the Late Triassic, 225 million years ago.
Leptosuchus is a phytosaur, a group of reptiles that resemble
crocodiles but evolved their form independently. He, along with
Buettneria inhabited the wetlands adjacent what are now the petrified
forests of Arizona.
Dilophosaurus is arguably the most famous dinosaur from Arizona.
Notable for the two crests on its head, this predator lived in the Early
Jurassic Period, about 200 million years ago. Dilophosaur remains and
footprints have been found in the Kayenta Formation of northeastern Arizona.