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paleozoic era comparison table

Subject	has duration	has start time
cambrian period	100 million years	600 million years ago
devonian period	60 million years	405 million years ago
mississippian period	35 million years	345 million years ago
ordovician period	75 million years	500 million years ago
pennsylvanian period	30 million years	310 million years ago
permian period	50 million years	280 million years ago
silurian period	20 million years	425 million years ago

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