Japanese researchers found that the sea surface water temperature in the northwestern Pacific fluctuated drastically from approximately 800,000 to 750,000 years ago, based on oxygen isotope analyses for fossil foraminifers from an uplifted marine succession in the Chiba composite section on Honshu Island, Japan. A comparison with the results obtained from deep-sea sediment cores suggests that the marine environmental change near the section, which was once deep-sea sediment, could be associated with the discharges of ice meltwater into the North Atlantic.
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Source: Phys.org