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24/02/2014 Scientists find oldest rock on Earth

3:18

How Scientists Found The Oldest Rock On Earth

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Detrital Zircons of the Jack Hills, Western Australia… - A. Brenner - 1/12/17

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How do we know the age of the Earth?

A team of researchers led by John Valley from University of Wisconsin-Madison confirmed that zircon from Western Australia’s Jack Hills region is the oldest fragment of Earth’s crust. Using two independent dating methods they calculated the age of the mineral to be 4.4 billion years. The Earth itself is around 4.54 billion years.
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