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Cryptic era

The Cryptic era is an informal term that refers to the earliest geologic evolution of the Earth and Moon. It is the oldest (informal) era of the Hadean eon, and it is commonly accepted to have begun c ...

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Dbpediathing

Archean

The Archean Eon (/ɑrˈkiːən/, also spelled Archaean; formerly Archaeozoic /ɑrkiːəˈzoʊɪk/), also spelled Archeozoic or Archæozoic) is a geologic eon before the Proterozoic Eon, before 2.5 Ga (billion ye ...