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Period: to
Historical Geology
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Cambrian 570m-500m
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ordovician 500m-435m
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Sulurian 435m-395m
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Devonian 395m-345m
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carboniferus 345m-280m
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permain 280m-225m
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triassic 225m-195m
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jurassic 195m-136m
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cretaceous 136m-65m
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tertiary 65m-1.8m
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quaternary 1.8m-present