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The major geologic time eras, listed from oldest to youngest, are the Precambrian, Paleozoic, Mesozoic, and Cenozoic. The Precambrian encompasses the formation of Earth and early life, while the Paleozoic era is characterized by the development of marine life and the emergence of terrestrial plants and animals. The Mesozoic, often called the "Age of Reptiles," includes the rise and fall of dinosaurs. Finally, the Cenozoic era, known as the "Age of Mammals," features the evolution of mammals and birds and the development of modern ecosystems.

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