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+ | The '''Archaean''' eon lasted from 4.0bya to 2.5bya. During this time the atmosphere had little oxygen and the sun was only between 70% and 75% as bright as it is today. The first single-celled life appeared during this eon which produced the oxygen in the atmosphere and the oldest fossils are found in this time period.[[File:Archean stromatolites 1280.jpg|thumb|400px|Precambrian Stromatolites]] |
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[[Category:Precambrian]] |
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Revision as of 16:58, 21 May 2020
The Archaean eon lasted from 4.0bya to 2.5bya. During this time the atmosphere had little oxygen and the sun was only between 70% and 75% as bright as it is today. The first single-celled life appeared during this eon which produced the oxygen in the atmosphere and the oldest fossils are found in this time period.
Precambrian Stromatolites