Paleoproterozoic

Proposed redefinition(s)2420–1780 MaGradstein et al., 2012Proposed subdivisionsOxygenian Period, 2420–2250 MaGradstein et al., 2012Jatulian/Eukaryian Period, 2250–2060 MaGradstein et al., 2012Columbian Period, 2060–1780 MaGradstein et al., 2012EtymologyName formalityFormalAlternate spelling(s)PalaeoproterozoicUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEraStratigraphic unitErathemTime span formalityFormalLower boundary definitionD…

Prebiotic atmosphereThe prebiotic atmosphere is the second atmosphere present on Earth before today's biotic, oxygen-rich third atmosphere, and after the first atmosphere (which was mainly water vapor and simple hydrides) of Earth's formation. The formation of the Earth, roughly 4.5 billion years ago, involved multiple collisions and coalescence of planetary embryos. This was followed by an over 100 million year period on Earth where a magma ocean was present, the atmosphere was mainly steam, and surface temperatures reached up to ...

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