the time of the physical formation and development of the earth (especially prior to human history)

approximately the last 63 million years

from 230 million to 63 million years ago

from 544 million to about 230 million years ago

the longest division of geological time

a unit of geological time during which a system of rocks formed

In the geologic record the Eoarchean (also spelled Eoarchaean) Era is the earliest time following the solidification of Earth's crust.

The Mesoarchean (also spelled Mesoarchaean) is a geologic era within the Archean, spanning 3,200 to 2,800 million years ago.

The Neoarchean (also spelled Neoarchaean) is a geologic era within the Archaean.

The Paleoproterozoic (also spelled Palaeoproterozoic) is the first of the three eras of the Proterozoic occurring between 2,500 to 1,600 million years ago.

The Mesoproterozoic is a geologic era that occurred from 1,600 to 1,000 million years ago.

approximately the last 63 million years

from 230 million to 63 million years ago

from 544 million to about 230 million years ago

the longest division of geological time

a unit of geological time during which a system of rocks formed