What is the longest period of geological time? [IAS Questions & Answers at BYJU’S]

Eons are the longest period of geological time.

It generally refers to a span of one billion years.

Eons are divided into small time intervals known as eras, which are further divided into periods, epochs, and ages.

There are three major Eons:

The Phanerozoic Eon: The Phanerozoic eon is the current eon that counts 538.8 years to the present. It has abundant plant and animal life.
The Proterozoic Eon: Refers to the geological period spanning from 2500 to 538.8 million years ago. During this period, the transition to an oxygenated atmosphere took place.
Archean Eon: It represents the geological time from 4000 to 2500 years ago.No fossil records were found from the Archean Eon.
Three eons, the Hadean, Archean, and Proterozoic Eons, are together known as the Precambrian.

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What is the longest period of geological time?