Mystery of ancient burrows older than earliest animals has been solved
Ancient animal burrows in rocks once thought to be 1.2 billion years old have been re-examined, and were likely made 40 to 50 million years ago by crustaceans
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Ancient animal burrows in rocks once thought to be 1.2 billion years old have been re-examined, and were likely made 40 to 50 million years ago by crustaceans
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