Results of this initial study indicate that the fission track method may be able to obtain uranium concentration values which are useful in carbonate depositional environment studies involving molluscan shell material. Variations in concentration values were found for different pelecypod genera and on different shell surfaces of the same genus. There is positive correlation between uranium concentration of the internal and external valve surfaces and concentrations of uranium in the associated water environments. Ocean waters contain about five times more uranium than fresh waters whereas uranium concentrations in modern marine shells exceed concentrations in fresh water shells by a factor of about 40.

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