Eoarchean
First era of the Archean Eon
Nº Q731470 ★★★
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Eoarchean
First era of the Archean Eon
The Eoarchean (IPA: EE-oh-ar-KEE-ən; also spelled Eoarchaean) is the first era of the Archean Eon of the geologic record. It spans 4,031 million years, from the end of the Hadean Eon 4031 Mya to the start of the Paleoarchean Era 3600 Mya.
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From Wikipedia
The Eoarchean (IPA: EE-oh-ar-KEE-ən; also spelled Eoarchaean) is the first era of the Archean Eon of the geologic record. It spans 4,031 million years, from the end of the Hadean Eon 4031 Mya to the start of the Paleoarchean Era 3600 Mya. Some estimates place the beginnings of life on Earth in this era, while others place it earlier. Evidence of archaea and cyanobacteria date to 3500 Mya, which is shortly after the Eoarchean. At that time, the atmosphere was without oxygen and the pressure values ranged from 10 to 100 bar (around 10 to 100 times the atmospheric pressure today).
Text: Wikipédia, CC BY-SA 4.0. · Image: James St. John (CC BY 2.0) ·
