Isotope Ratios in Marine Mollusk Shells after Prolonged Contact with Flowing Fresh Water

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Science  27 Dec 1963:
Vol. 142, Issue 3600, pp. 1666
DOI: 10.1126/science.142.3600.1666


The ratios C13/C12 and O18/O16 in the calcium carbonate of shells of the marine mollusk, Macoma calcarea, appear unaltered after exposure for 4500 years to flowing fresh water of higher O16/O18 ratio.