The two eons of Precambrian Time are the Hadean Eon and the Archean Eon. The Hadean Eon is the earliest part of Earth's history, spanning from the formation of the Earth about 4.6 billion years ago to about 4 billion years ago. The Archean Eon follows, lasting from about 4 billion to 2.5 billion years ago, during which the Earth's crust cooled and stable continents began to form, and the earliest known life forms, primarily prokaryotic microorganisms, emerged. The Precambrian also includes the Proterozoic Eon, which follows the Archean, but the question specifically asked for two eons.
What are the two eons of Precambrian Time?
1 answer