The 40-mile wide crater is more than 2.2 billion years old.
At roughly 2.2 billion years old, the approximately 40-mile wide Yarrabubba crater was previously considered to be among the Earth's oldest meteorite impact structures, but lacked a precise age -- until now.
A Space Station image of the Yarrabubba structure in Australia, site of the oldest known impact crater on Earth.To calculate the age of crater, scientists analyzed recrystallized mineral deposits, according to Timmons Erickson, lead author of the new paper and a research scientist at NASA."Without the precise age, we would have had no clue that Yarrabubba occurred at such an interesting time in Earth’s history," he told ABC News.
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