Secondary Calcification of the Planktonic Foraminifer Neogloboquadrina pachyderma as a Climatic Index

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Science  15 Nov 1974:
Vol. 186, Issue 4164, pp. 630-632
DOI: 10.1126/science.186.4164.630


Oscillations in the ratio of two principal types of secondary calcification of the test surface in Neogloboquadrina pachyderma populations closely parallel paleoclimatic oscillations over the last 6 million years in a deep-sea core drilled in the temperate South Pacific. The nature of secondary calcification in fossil planktonic foraminifera represents a useful index in interpreting Cenozoic climates.