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Encyclopædia Britannica, Inc.The Phanerozoic Eon, also known as the eon of visible life, is divided into three major eras of time largely based on fossils of different groups of life-forms found within them: the Paleozoic (542 million to 251 million years ago), Mesozoic (251 million to 65.5 million years ago), and Cenozoic (65.5 million years ago to the present) eras. The three eras can be divided into a collection of 12 different periods. During each period, Earth’s continents made steady progress toward their present configuration through such processes as continental drift, mountain building, and continental glaciation. Although the Phanerozoic Eon represents only about the last one-eighth of time since the Earth’s crust formed, its importance far exceeds its relatively short duration, because the eon is characterized by the rapid evolution of life, sometimes through cataclysmic mass extinction events, and other challenges. The descendants of these early life-forms are the plants, animals, and other life that abide on Earth today.
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