Abstract
Sodium content of bone and dentine of modern Bison bison is more (0.68-0.83 wt. %) than that of the enamel (0.50-0.56 wt. %). In fossil bone and dentine the sodium content is much lower (0.15-0.41 wt.%) than in corresponding modern samples while there appears to be no significant difference between modern and fossil enamel in most instances. The lowered sodium content in fossil material appears to be attributable to diagenetic removal. The physical properties of the bone have a strong influence on the amount of sodium removed.
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