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Geologic time | Periods, Time Scale, & Facts

Geologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago). ....

International Chronostratigraphic , International Commission On Stratigraphy , Archean Eon , Hadean Eon , International Chronostratigraphic Chart , International Commission , Geologic Time ,