Archean Eon

Meaning

The second eon of Earth's history, spanning from approximately 4 billion to 2.5 billion years ago, characterized by the formation of the first continents and the emergence of early life.

Examples

• The Archean eon saw the development of the earliest known fossil evidence of life.
• Geologists study rock formations from the Archean eon to understand the cooling of the early Earth's crust.