Oxygen-Isotope Ratios in Phosphate from Fossil Marine Organisms

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Science  24 May 1968:
Vol. 160, Issue 3830, pp. 879-882
DOI: 10.1126/science.160.3830.879


Well-preserved fossil marine organisms generally yield very positive δ18(PO43-) values which are considered to result from relatively good preservation of the original oxygen-isotope composition of phosphatic material deposited under isotopic equilibrium conditions in oceanic water whose O18:O16 ratio was more positive than that of modern oceans.

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