| Earth's surface was incredibly unstable during the early part of the Hadean Eon. |
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| Hadean Eon, informal division of Precambrian time occurring between about 4.6 billion and about 4.0 billion years ago. |
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| Zircon crystals found here are the oldest rocks on Earth: remnants of the Hadean aeon, 4.4 billion years ago. |
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| During Hadean time, the Earth and Solar System formed by coagulation and gravitational contraction from a large cloud of gas and dust around the sun, called an accretion disc. |
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| The Hadean, Archean and Proterozoic eons were as a whole formerly called the Precambrian. |
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| China's deposits are distributed mainly in Maoming, Hadean, Fushun, Longkou, etc. |
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| For the Hadean Eon, the only record comes from meteorites and lunar rocks. |
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| The appeal of an underground park is pretty clear: it's got a sci-fi neato factor, and for the melancholics out there, it would serve as a kind of Hadean companion to the sunny Highline. |
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| Sometimes the Hadean, Archean and Proterozoic are lumped together in a supereon called the Precambrian. |
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| Since Hadean times, nearly all of this original crust has subducted from the movements of tectonic plates, and thus few rocks and minerals remain from the interval. |
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| However, there is evidence for the presence of water on the early Earth, in the Hadean and Archean eons, leading to what is known as the faint young Sun paradox. |
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