Archean Eon
Taylor Cobb
Created on September 30, 2024
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Transcript
Considered first appearance of life on Earth. The oldest fossils found date back to this eon
Resources Catling, David C, and Kevin J Zahnle. “The Archean Atmosphere.” Science advances 6.9 (2020): eaax1420–eaax1420. Web. Schopf, J. William et al. “Evidence of Archean Life: Stromatolites and Microfossils.” Precambrian research 158.3 (2007): 141–155. Web.
3,850 - 2,500 Ma
Archean Eon
Fun Facts!
Only 2%-3% of the Earth was dry land.
The amount of oxygen emitted into the atmosphere prior was a very small amount.
Major Event
During this time photsynthesizing bacterias began to form. These cyanobacterias flooeded the atmosphere with waste (oxygen) . This effected the climate of the Earth and caused the Huronian glaciation. This catastrophe is considered one of the biggest exctinction events.
The oldest fossils known that were found during this eon were found in Western Australia 3.5 billion years ago.
The oxygen being released was poisoning anaerobic microbes.
The oceans were full of iron and appeared green due to rust.
Fun Facts!
The atmosphere experienced a flood of oxygen during this eon due to photosynthesizing bacterias.
Photosynthesizing bacteria began to form and affect the atmosphere.
The average surface temperature for this eon was between 0 and 40 degrees Celcius.
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