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.