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Hadean | Archean | Proterozoic | Phanerozoic
English: The Hadean is the geologic eon before the Archean. It extends back to the Earth's formation, and ended roughly 3.8 billion years ago (3800 Ma), though the date varies according to different sources. The name "Hadean" derives from Hades, Greek for "unseen" or "Hell" and suggesting the underworld or referring to the conditions on Earth at the time.
first eon of geological time, the beginning of Earth
|Instance of|| geological eon,|
|Start time||4,601st millennium BC (statement with Gregorian date earlier than 1584)|
|End time||4,001st millennium BC (statement with Gregorian date earlier than 1584)|