The Archean eon was a time when Earth's atmosphere and ocean were devoid of gaseous oxygen, but also when the first organisms to generate energy from sunlight evolved.

Rocks dating back to the Earth’s Hadean Eon have finally had their antiquity confirmed as stretching back at least 4.16 ...

Back during the Archean Eon, between 2.5 billion and 4 billion years ago, Earth’s mantle was much hotter. Geologists have estimated that Earth’s interior was more than 360 degrees Fahrenheit ...

The Archaean eon was a time when Earth's atmosphere and ocean were devoid of gaseous oxygen, but also when the first organisms to generate energy from sunlight evolved.

An artist’s illustration of Earth as it may have been during the Archean eon between 3.8 billion and 2.5 billion years ago, a time of violent asteroid impacts and volcanic eruptions.

The only period of Earth’s geologic history known to include such high temperatures was between 2.5 and 4 billion years ago during the Archean Eon. Consequently, the researchers inferred that these ...

Roughly between 3.8 and 1.8 billion years ago, during the Archean eon when life was confined to single cells in the oceans, rainfall eroded iron from continental rocks.

The Archean Eon (4–2.5 million years ago) is the second of Earth’s four major geologic eons, a time when the planet was mostly covered by oceans extending far deeper than those found today.

The Archaean eon was a time when Earth's atmosphere and ocean were devoid of gaseous oxygen, but also when the first organisms to generate energy from sunlight evolved.