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The oxygen isotopic composition of Globigerinoides sacculifer in 30 surface sediment samples from the southwestern Indian Ocean has been measured. The coverage is sufficient to enable isotherms to be constructed from isotopically estimated temperatures, which reflect the effect of the Agulhas Current. The isotopic measurements indicate near summer temperatures. Isotopic analysis of samples from the 18,000 B.P. level in cores should permit paleo-isotherms to be constructed for the Agulhas Current of the glacial period.

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