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Beginning of Cambrian period 570M-500M
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End of Cambrian period. Beginning of Ordovician period. 500M-435M
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End of Ordovician period. Beginning of Silurian Period. 435M-395M
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Trilobites
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End of Silurian period. Beginning of Devonian period 395M-345M
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End of Devonian period. Beginning of Carboniferous period 345M-280M
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End of Carboniferous period. Beginning of Permian period 280M-225M
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End of Permian period. Beginning of triassic period 225M-195M
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End of Triassic period. Beginning of Jurassic period 195M-136M
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End of Jurassic period. Beginning of Cretaceous period 136M-65M
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End of Cretaceous period. Beiginning of Tertiary period 65M-1.8M
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End of Tertiary period. Beginning of Quaternary peruiod 1.8M-Present
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End of Quaternary period. Present
