The Paleozoic, or "Old Life", Era is sometimes called the "Age of Fishes." It began with the Cambrian Explosion, a short period of time in which an enormous diversification of complex life occurred, and ended with the great Permian/Triassic mass extinction. It is composed of the Cambrian, Ordovician, Silurian, Devonian, Carboniferous (Mississippian and Pennsylvanian in North America), and Permian Periods. This category is for any website dealing with the Paleozoic fossil record.

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The Paleozoic
An overview of the era from the Ordovician Period to the Permian, with maps and timelines.
The Paleozoic Era
An overview of the era from the UC Berkeley Museum of Paleontology.
The Paleozoic Era
An illustrated geological timeline.
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