On Feb. 24, 2014, scientists announced that a tiny zircon crystal from Australia, 4.4 billion years old, was confirmed to be the oldest discovered fragment of Earth's crust. On This Day, Feb. 24: Scientists announce oldest-known fragment from Earth's crust
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On Feb. 24, 2014, scientists announced that a tiny zircon crystal from Australia, 4.4 billion years old, was confirmed to be the oldest discovered fragment of Earth's crust. 
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