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During the Archaean Eon

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During the Archaean Eon

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The Archaean eon was a geological eon spanning from around 3800 to 2500 million years ago, comprising the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras - a period in which the first continents and oceans sprang up.

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thermophiles

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They are fossils cyanobacteria from the Archaean eon.

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The era in which Earth was the hottest was called the Archaean era. This was when the ocean temperatures were above 100 degrees.

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