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Tarantula Lobbyist
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An extremely small piece of zircon found in Australia has been dated to 4.4 billion years old, and likely formed at the Earth's very first cooling and crust formation.

"Earth itself is a bit more than 4.5 billion years old, and the researchers hope the new finding offers insights into the formation of the moon and the first continents. The Jack Hills rocks formed only about 160 million years after the formation of the solar system-which is surprisingly early."

Earth's Oldest Crust Dates to 4.4 Billion Years Ago

4.4 billion-year-old crystal is oldest piece of Earth - CNN.com
 
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