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The 87 Sr/ 86 Sr isotopic composition of the enameloid tips of teeth of Scapanorhynchus texanus, a common and widespread upper Cretaceous shark, differs from that found in the dentine inner portions of the same teeth. Using a marine 87 Sr/ 86 Sr isotopic evolution curve, we converted the 87 Sr/ 86 Sr isotopic composition of different sections of the...
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