,

Science (New York, N.Y.)
|August 1, 1980
PubMed
まとめ

過去450万年にわたる古海洋学的な出来事は,動物学および石器学的な証拠を用いて再構築されました. 恒常的な海氷の覆いは,約070万年前に始まった.

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