Period Triassic Period

Triassic Period 7

• 251.902 Ma End-Permian Extinction The Great Dying — 96% of marine species lost Largest mass extinction; caused by Siberian Traps volcanism, ocean acidification and anoxia.
• 231–228 Ma · Late Triassic Eoraptor One of the earliest dinosaurs A small omnivorous dinosaur from Argentina, Eoraptor is among the earliest known dinosaurs. About 1 metre long, it walked on two legs and represents the basal stock from which all dinosaurs evolved.
• 231 Ma First Dinosaurs Triassic origin of dinosaurs Earliest dinosaurs appear in South America after the P-T extinction recovery.
• 231–229 Ma · Late Triassic Herrerasaurus Early large predatory dinosaur One of the earliest and largest predatory dinosaurs, Herrerasaurus was a powerful bipedal carnivore up to 6 metres long from Argentina. It lived alongside Eoraptor in the Late Triassic.
• 225 Ma First Mammals Tiny Triassic ancestors Small insectivorous mammals appear alongside early dinosaurs.
• 214–204 Ma · Late Triassic Plateosaurus Early large herbivorous dinosaur One of the first large dinosaurs, Plateosaurus was a prosauropod up to 10 metres long from Europe. It could walk on all fours or rear up on its hind legs to browse high vegetation.
• 201.4 Ma End-Triassic Extinction CAMP volcanism Massive volcanism as Pangaea rifts apart; ~80% of species lost; clears way for dinosaur dominance.