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proterozoic eon
Luisa Cordova
Created on September 29, 2024
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Proterozoic Eon
This Eon started 2.5 billion years ago, and ended 451 Million Years ago.
During the early proterozoic Era, 97-98% of the Earth was covered in water, and these oceans were not the typical blue color we know today. These waters were more green in color, because they had high levels of iron, and barely any oxygen. The lack of oxygen in the atmosphere and oceans was due to the lack of photosynthesizers. Instead, these oceans were filled with Anaerobic Microbes, and they do not need oxygen to survive or reproduce.
what was the world like?
Proterozoic Eon
The world was covered in cyanobacteria, leading to a rapid rise in oxygen. This catastrophe almost led to full extinction of every living thing on this planet. The world's oceans used to contain anaerobic microbes--and they don't need oxygen. As photosynthesizers created more oxygen, anaerobic microbes were being poisoned. Temperatures were dropping, causing the first ice age to start.
Major Event - The Great Oxygenation Event
Proterozoic Eon
- Complex Eukaryotes evolved from simple Prokaryotes during this eon. - There are 10 periods within the Proterozoic Eon. - Once oxygen levels regulated themselves, the ozone layer we know today started to form, still during this eon. - It is assumed this is when Eukaryotic cells started to show differences between plant and animal cells.
Interesting facts!
Proterozoic Eon
Oxygen Catastrophe. (n.d.). In Encyclopedia of Astrobiology (pp. 1196–1196). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-11274-4_2891 Gradstein, F.M. (2011). Proterozoic (Aeon). In: Gargaud, M., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11274-4_1291