2800-2500 Ma
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§ Neoarchean Era
The present continents are built around extremely ancient rock cores called shields. A large portion of Australia, Canada, India, Scandinavia and Siberia are made up of shield rock.
Oxygenic photosynthesis first evolved in this era and was accountable for the oxygen catastrophe which was to happen later in the paleo proterozoic 2.4 from a poisonous buildup of oxygen in the atmosphere, produced by these oxygen producing photoautotrophs, which evolved earlier in the neoarchean.
§ Sources
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