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Short "hint"

n. - The earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago);

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Usage examples (37)
  • The Hadean has also sometimes been called the Priscoan.
  • The Archaean occurs between the Hadean and the Proterozoic.
  • For example, Hadean Eon represents the time on Earth when life did not exist.
  • Hadean tunnel, but it would be an evil spirit who could tolerate it for the best part of an hour.
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