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The Archean Eon , in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth's history, preceded by the Hadean Eon and followed by the Proterozoic. The Archean represents the time period from 4,031 to 2,500 Ma (millions of years ago). The Late Heavy Bombardment … See more
The word Archean is derived from the Greek word arkhē (αρχή), meaning 'beginning, origin'. The Pre-Cambrian eon had been believed to be without life (azoic); however, … See more
The processes that gave rise to life on Earth are not completely understood, but there is substantial evidence that life came into existence either near the end of the Hadean Eon or … See more
• "Archean". GeoWhen Database. stratigraphy.org. Archived from the original on 22 August 2010. Retrieved 17 September 2010. See more
The Archean atmosphere is thought to have almost completely lacked free oxygen; oxygen levels were less than 0.001% of their … See more
• Abiogenesis – Life arising from non-living matter
• Cosmic Calendar – Method to visualize the chronology of the universe
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WEBThe Archean (formerly Archaeozoic) is a geologic eon between the Hadean and Proterozoic eons. The Archean Eon begins at roughly 3.8 billion years ago (Ga) and ends at about 2.5 Ga. But unlike all other geological ages, …
WEBThe Archean eon, which preceded the Proterozoic eon, spanned about 1.5 billion years and is subdivided into four eras: the Neoarchean (2.8 to 2.5 billion years ago), Mesoarchean (3.2 to 2.8 billion years ago), …
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