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Four-billion-year-old rocks show signs of early life

The geological history of planet Earth is replete with the evidence that our planet has hosted life nearly since its formation. The latest signal comes from a carbon-12–enriched piece of graphite recovered from rocks in the Torngat mountains in northeastern Canada, which formed 4 billion years ago, The Atlantic reports. Although still 100 million years shy of the controversial record observed in 4.1-billion-year-old zircon gemstone discovered in Western Australia, the new findings, published yesterday in Nature, add support to the fact that life on Earth was both ancient and widespread.

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