+The **Paleozoic** Era, or "ancient life," stretched across Earth's history from 541 to 252 million years ago. It saw the burst of complex life, from early marine creatures to the first forests and [vertebrates](/wiki/Vertebrates) conquering land, concluding with Earth's greatest [mass extinction](/wiki/Mass_Extinction).
+## See also
+- [Geologic Time](/wiki/Geologic_Time)
+- [Cambrian](/wiki/Cambrian)
+- [Mesozoic](/wiki/Mesozoic)
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