The Triassic period its the first period of the Mesozoic era,know because there was the first dinosaurs and more Mammal-Like Reptiles,like Placerias,Lystrosaurus,etc...

This period succeeded the Permian Period and preceded the Jurassic Period.

Time of Start: 250 Mya

(millions of years ago)

Time of ending: 200 Mya
Extinctions: One(at 201 Mya)

Triassic Mass Extinction.

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