A lower 18O /16O ratio in ocean core sediments is indicative of warmer temperatures,whereas a lower 18O /16O ratio in ice cores is indicative of cooler temperatures.

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This is because 18O is preferentially incorporated into ice during colder periods, leading to a lower 18O/16O ratio in ice cores. In contrast, during warmer periods, more 18O evaporates from the ocean, leading to a lower 18O/16O ratio in ocean core sediments.

A Lower 18O /16O Ratio in Ocean Core Sediments Is