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Geologic time begins with a very long span called Precambrian Time. Precambrian Time ended about 544 million years ago. Since then, the basic units of geologic time are, in order from longest to short
Geologic time begins with a very long span called Precambrian Time. Precambrian Time ended about 544 million years ago. Since then, the basic units of geologic time are, in order from longest to shortest: