Which of the following is the shortest division of geologic time?

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BlackTom AI · Accepted Answer

Geologic time is divided hierarchically into eons, eras, periods, epochs, and ages, with each level representing progressively finer divisions of time.
Option: Epoch. An epoch is a subdivision of a period and is indeed the smallest basic unit listed here, making it the shortest division of geologic time among the options.
Option: Eon. An eon is the largest span of geologic time, comprising multiple eras, and is much longer than an epoch.
Option: Period. A period is a mid-range division, larger than an epoch but smaller than an era; it stretches over tens of millions of years rather than being the smallest unit.
Option: Era. An era spans multiple periods and is longer than a period, again making it a longer interval than an epoch.
In summary, the hierarchy goes eon > era > period > epoch, so the epoch represents the shortest subdivision listed.

Which of the following is the shortest division of geologic time?

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