Hadean

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Hadean

[′hā·dē·ən]
(geology)
The period (more than 3800 million years ago) extending for several hundred millions of years from the end of the accretion of the earth to the formation of the oldest recognized rocks.
References in periodicals archive ?
Geologists call that time the Hadean Eon, and thought its fiery hell of impacts would have sterilised the Earth.