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Eoarchean

EtymologyName formalityFormalAlternate spelling(s)EoarchaeanUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitEraStratigraphic unitErathemTime span formalityFormalLower boundary definitionTen oldest U-Pb zircon agesLower boundary GSSAAlong the Acasta River, Northwest Territories, Canada65°10′26″N115°33′14″W / 65.1738°N 115.5538°W / 65.1738; -115.5538Lower GSSA ratified2023Upper boundary definitionDefined ChronometricallyUpper GSSA ratifiedNot formally definedThe Eoarchean (IPA: ; also spelled Eoarchaean) is the first era of the Archean Eon of the geologic record.

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