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Neoarchaean

Events of the Neoarchean EraVertical axis scale: Millions of years agoProposed redefinition(s)2780–2420 MaGradstein et al., 2012Proposed subdivisionsMethanian Period, 2780–2630 MaGradstein et al., 2012Siderian Period, 2630–2420Gradstein et al., 2012EtymologyName formalityFormalAlternate spelling(s)NeoarchaeanUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEraStratigraphic unitErathemTime span formalityFormalLower boundary definitionDefined ChronometricallyLower GSSA ratifiedNot formally definedUpper boundary definitionDefined ChronometricallyUpper GSSA ratified1990The Neoarchean ( ; also spelled Neoarchaean) is the last geologicera 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.

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