• Kyodo

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Japanese researchers said Monday they have found the country’s oldest known rock, dating back 2.5 billion years, in Shimane Prefecture — around 500 million years earlier than the previous oldest discovery.

A team from Hiroshima University collected fragments of the rock, which is located near a forest road in the town of Tsuwano. The granite-gneiss metamorphic rock, formed by intense heat, has a striped appearance.

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