eon is the period now .
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An eon is the largest division of geologic time, lasting billions of years. An era is a subdivision of an eon, typically lasting hundreds of millions of years. A period is a smaller division of geologic time, lasting millions of years, and an epoch is an even smaller division of time, typically lasting tens of millions of years.
Eon, Era, and Epoch: APEX :D
Eon, era, period, epoch.
Eon, era, period, epoch.
The order from largest to smallest is eon, era, period, and epoch. Eons are the longest divisions of time, followed by eras which encompass multiple eons, then periods which are subdivisions of eras, and finally epochs which are subdivisions of periods.
The geologic time intervals from longest to shortest are eon, era, period, epoch, and age. This hierarchical sequence represents the largest divisions (eons) to the smallest subdivisions (ages) of Earth's history.