Ancient minerals fill in lost chapter of Earth's history
Scientists from the Australian National University in Canberra studying ancient minerals have filled in some gaps in our picture of Earth in the Hadean eon, 4.4. billion years ago. The Jack Hills, in mid-west Western Australia, are home to the world's oldest known mineral samples, called detrital zircon grains. These small zircon grains are the only known geological record of the Earth's crust from the Hadean eon. No other rocks remain from that period to provide us with clues about how Earth's first crust was formed.
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