Oxygen and Carbon Isotopes from Calcareous Nannofossils as Paleoceanographic Indicators

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Science  15 Aug 1975:
Vol. 189, Issue 4202, pp. 555-557
DOI: 10.1126/science.189.4202.555


Oxygen-18 and carbon-13 analyses of well-preserved calcareous nannofossils have been compared with those of foraminifera contained in Cenozoic cores collected in the Southern Ocean during the Deep Sea Drilling Project. The results indicate that calcareous nannofossils deposit calcium carbonate at or near equilibrium with oceanic surface waters and that they can be used as paleotemperature indicators.