THE ARCHEAN EON? The Archean Eon (4.0–2.5 billion years ago) marks one of Earth's earliest chapters, when the planet’s first stable continental crust formed. Life began to emerge in the form of simple microorganisms, while volcanic activity and the growth of ancient cratons shaped our world’s foundations. It was a time when Earth's atmosphere lacked oxygen, yet it set the stage for the evolution of more complex life. Follow Geomark Seismics Survey and Drilling Services. for more fascinating geol

ARCHEAN EON Introduction / Definition The Archean Eon is a major division of geological time, spanning from about 4.0 to 2.5 billion years ago. It is the second eon of Earth’s history, following the Hadean Eon and preceding the Proterozoic Eon. The name “Archean” comes from the Greek word archē, meaning “beginning” or “origin,” reflecting the early development of Earth’s crust, continents, and the earliest known life. CHARACTERISTICS OF THE ARCHEAN EON 1. Formation of the Earth’s Crust The Earth