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The Cambrian Period witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Fish, arthropods, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms.
The Devonian | The Carboniferous: Coal Swamps and Glaciers | The Permian | The Great Permian Extinction. Learning Objectives | Terms | Review Questions | Links | References. The Paleozoic era literally translates as the time of ancient life and spans the time period between 544 and 245 million years ago. The Paleozoic is the first of three eras within the Phanerozoic eon (the time of visible life). While life originated during the Archean and increased in complexity during the earlier Proterozoic, the Paleozoic era is marked by the spread of animals with hard preservable parts such as shells and exoskeletons.