4.4 billion-year-old crystal is oldest piece of Earth

February 25, 2014 13:45

From a sheep ranch in Western Australia comes the oldest slice of Earth we know. Scientists say they have dated an ancient crystal called a zircon to about 4.4 billion years, making it the earliest confirmed piece of the planet's crust. The findings -- the first to describe the zircon -- were published in the journal Nature Geoscience on Sunday. Read

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