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Era in planet Earth's geological record lasting from ~540 million years ago to ~250 million years ago.
The Paleozoic era begins with the Cambrian explosion and ends with the Permian mass extinction.
Making up the Paleozoic era are six periods (mya = million years ago):
The Paleozoic era is preceded by the Proterozoic eon and is followed by the Mesozoic era.
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