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The Jack Hills are a range of hills in Mid West Western Australia. They are best known as the source of the oldest material of terrestrial origin found to date: Hadean zircons that formed around 4.39 billion years ago. These zircons have enabled ground-breaking research into the conditions on earth in the Hadean eon. In 2015, "remains of biotic life" were found in 4.1 billion-year-old rocks there. According to one of the researchers, "If life arose relatively quickly on Earth ... then it could be common in the universe."