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Geological Time Scale. 600 mya. Present. first reptiles 350. first vertebrates 500 mya. Archaeopteryx 160 mya. first amphibians 400. first bony fish 425. 230. 65. ERA. Paleozoic. Mesozoic. Cenozoic. 180. 135. 2. PERIOD. Triassic. Jurassic. Cretaceous. Tertiary. Quaternary.
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Geological Time Scale 600 mya Present first reptiles350 first vertebrates500 mya Archaeopteryx 160 mya first amphibians400 first bony fish425 230 65 ERA Paleozoic Mesozoic Cenozoic 180 135 2 PERIOD Triassic Jurassic Cretaceous Tertiary Quaternary