Cenozoic Era: Modern day, Started 66.4 million years ago, Ice ages, Age of mammals, Human ancestors and modern humans, Mesozoic Era: Continents drift closer to current positions, 1st birds, Started 251 million years ago, Paleozoic Era: 1st reptiles, cambrian explosion, Precambrian Era: Longest era, Starts at beginning of earth, 1st organism,

Geologic Time Scale and the 4 Eras Grouping

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