There is a significant lack of coal from this period, probably due to the (*) mass extinction preceding it, which saw the end of the trilobites and largest percentage of species lost in any extinction event.
Fossils of this period's Herrerasaurus are found in Argentina's Valley of the Moon. The most common fossils from the early part of this period belong to Lystrosaurus, one of the few surviving synapsids from the previous period, which were largely replaced by archosaurs in this period. Although it did not separate in this period, Pangaea began to break up. There is a significant lack of coal from this period, probably due to the (*) mass extinction preceding it, which saw the end of the trilobites and largest percentage of species lost in any extinction event. For 10 points, name this period following the Permian during which the dinosaurs arose, the first of the Mesozoic era.
Fossils of this period's Herrerasaurus are found in Argentina's Valley of the Moon.
Triassic Period