Hadean time


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Related to Hadean time: Archean

Ha·de·an Time

n.
The Hadean period of time. Also called Hadean Eon. See Table at geologic time.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Ha·de·an Time

(hā-dē′ən)
The period of time between 4.6 and 3.8 billion years ago, when the solar system was forming and the Earth was solidifying. No rocks are known from this time, as they were probably eroded or drawn deep into the Earth and melted through the processes of plate tectonics. See Chart at geologic time.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Noun1.Hadean time - 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); no evidence of life
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References in periodicals archive ?
In recent simulations of Earth during Hadean times, Mojzsis and Oleg Abramov, also at the University of Colorado at Boulder, "have bombarded the crust with basically everything we could throw at it within reason, based on the Nice model and the lunar record," Mojzsis says.
As so well demonstrated by the Moon's thoroughly cratered surface, Earth was impacted as much as any other planet, especially in the period before 3.8 Ga during the elusive Hadean times. The relative paucity of impact structures on Earth (174 versus, for example, more than 40 000 named on Mars) is due to the dynamic nature of our planet (like that of Venus), with subduction, volcanic activity, weathering and sedimentation leading to the relatively rapid destruction, or burial, of most impact features.