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Paleozoic Era

Paleozoic Era, major division of geological time, preceded by Precambrian time and followed by the Mesozoic Era, and including the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods. The Paleozoic Era began about 540 million years ago and ended about 250 million years ago. The evolution of life, from primitive, multicellular, free-floating forms in the sea to advanced groups on land, can be traced by fossil remains in rock strata of the Paleozoic Era. See Evolution; Geology.

"Paleozoic Era," Microsoft® Encarta® Online Encyclopedia 2008
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