Geologic time periods are uniformly divided into increments of five million years.

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Geologic time periods are not uniformly divided into increments of five million years. The lengths of the periods vary greatly and are based on significant geological and biological events. For example, the Paleozoic Era (542 million to 252 million years ago) is divided into seven periods, ranging in length from about 5 million to 60 million years.

Geologic Time Periods Are Uniformly Divided into Increments of Five