No Early Triassic rocks are preserved in New Mexico, and only a thin layer of Middle Triassic rocks is present in the northern half of the state. During the first part of the Triassic Period, New Mexico must have been an erosive landscape in which few rocks were formed.
Lystrosaurus (LIS-troe-sore-us) was a plant-eating animal that resembled a tiny, flat-faced hippo with a beak and two tusks. Its remains have been found in Early Triassic rocks on four continents (Africa, Antarctica, Asia, and Europe). This global distribution is evidence that the Early Triassic continents were united as a single landmass (called Pangea).