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Palaeozoic (Geology Dictionary)

Palaeozoic : Also spelled Paleozoic.

The earliest of the three geologic eras of the Phanerozoic Eon, spanning the time from roughly 541 to 252.2 million years ago. It is the longest of the Phanerozoic eras and is subdivided into six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The Paleozoic Era follows the Neoproterozoic Era of the Proterozoic Eon, and is followed by the Mesozoic Era.

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