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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
That's slightly higher than Earth's average heat loss today but only one-third to one-fifth the rate expected for the Hadean eon.
Geologists call that time the Hadean Eon, and thought its fiery hell of impacts would have sterilised the Earth.