Blackwell Publishing
Precambrian Paleozoic Mesozoic Cainozoic
Triassic 248 MYRBP Jurassic 213 MYRBP Cretaceous 144 MYRBP

Although small mammals were present at the beginning of the Jurassic, they remained a small group and did not radiate for millions of years: the earth was dominated by reptiles - like this magnificent Iguana from the Galapagos Islands - until the late Jurassic, which marks the beginning of the Age of Dinosaurs.

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