GEOLOGY

Detailed explanation-1: -To make geologic time easier to comprehend, geologists divided the 4.6 billion years of Earth’s history into units of time called eons. Then they further divided the eons into two or more eras, eras into two or more periods, periods into two or more epochs, and epochs into two or more ages.

Detailed explanation-2: -The geologic time scale is divided into (from longest to shortest): eons, eras, periods, epochs and ages.

Detailed explanation-3: -Eon: Two or more eras compose an Eon. This is the largest division of time, lasting hundreds of millions of years.

Detailed explanation-4: -Eons are the largest intervals of geologic time and are hundreds of millions of years in duration. In the time scale above you can see the Phanerozoic Eon is the most recent eon and began more than 500 million years ago. Eons are divided into smaller time intervals known as eras.

Detailed explanation-5: -One of the key concepts of the Geologic Time Scale is the division of time into units of varying lengths. The largest unit is the eon, which is further divided into smaller units such as eras, periods, and epochs.