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Radiation of species at late mid-Triassic

Can anyone explain the extraordinary radiation of new orders of animal life
late in the mid-Triassic. This fruitful period spawned the earliest
dinosaurs, therapsids, thecodonts, pterosaurs, and perhaps even birds. This
remarkable diversification of higher life forms has not been matched since.
   What environmental factors contributed to this, other than the
Permain-Triassic extinctions?