最終更新日：2024/07/28

(geology) A hypothetical early supercontinent which may have existed on Earth during the Archaean eon (3.1 billion years ago).

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(geology) A hypothetical early supercontinent which may have existed on Earth during the Archaean eon (3.1 billion years ago).

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(geology) A hypothetical early supercontinent which may have existed on Earth during the Archaean eon (3.1 billion years ago).