GEOLOGICAL TIME |
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The Earth is
about 4.5 billions years old. During its long life its surface has seen
much transformation as![]() How Geologic time is measured Eons - The largest arbitrary periods of time are called Eons and account for up to billions of years. Archeon - 4.6 to 2.5 BYA (billion years ago) Proterozoic - 2.5 to .59 BYA Phanerozoic - .59 BYA to the present
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