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.
Kayenta Formation
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.
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