What is the smallest defined unit of time on the geological scale?

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Advanced Placement (AP)

15 July, 08:28

What is the smallest defined unit of time on the geological scale?

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Corinne Li · Answer 1

I believe that the smallest defined unit of time on the geological scale are ages.

Here are all of them, ranked from largest to smallest: eons, eras, periods, epochs, and ages.

Eons are very large chunks of time which encompass more than 500 years, whereas ages can last from a couple of years to about a hundred.