This era saw the rise of oxygen in the atmosphere after oxygenic photosynthesis evolved in cyanobacteria as early as the Mesoarchean era.

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Neoarchean

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Wikipedia contributors. (2024, February 10). Neoarchean. In Wikipedia, The Free Encyclopedia. Retrieved April 18, 2024, from https://en.wikipedia.org/w/index.php?title=Neoarchean&oldid=1205821914

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https://github.com/davepinch/pinchy.cc/blob/master/content/topics/geology/subdivisions/eras/neoarchean/ascend/snippet-complex-life-1-1.md

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Sirius A is classed as a type Am star, because the spectrum shows deep metallic absorption lines, indicating an enhancement of its surface layers in elements heavier than helium, such as iron.

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Neoarchean (Wikipedia) The Neoarchean (/ˌniːoʊ.ɑːrˈkiːən/ NEE-oh-ar-KEE-ən; also spelled Neoarchaean) is the last geologic era in the Archean Eon that spans from 2800 to 2500 million years ago—the period being defined chronometrically and not referencing a specific level in a rock section on Earth. The era is marked by major developments in complex life and continental formation.

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oxygen
photosynthesis
cyanobacteria
Mesoarchean
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