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The Paleozoic Era
An overview of the era from the UC Berkeley Museum of Paleontology.
Paleozoic - Wikipedia, the free encyclopedia
The Paleozoic or Palaeozoic Era (from the Greek palaio, "old" and zoe, "life", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic eon.
Palaeos Paleozoic: The Paleozoic Era
An intro to the Paleozoic era, includes a review of each of the geological sub-divisions and the various forms of life that lived during this time

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Paleozoic Era

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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.