The oldest rocks on Earth date back to 4.28 billion years old and were found in western Australia.

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The oldest rocks on Earth, known as the Acasta Gneiss, are about 4.03 billion years old and were found in the Northwest Territories of Canada. The rocks in Western Australia, specifically the zircon crystals found in the Jack Hills region, are the oldest known materials on Earth, dating back to about 4.4 billion years, but they are not part of a larger rock formation like the Acasta Gneiss.

The Oldest Rocks on Earth Date Back to 4