The iron content of Tertiary bones from Wyoming varies with age, the older bones generally having a higher content. The changes are not strictly proportional to age, but are step-like, and, thus, time is rejected as the controlling factor. Instead climatic changes operating through soil-forming processes are proposed as the main cause of variations in iron content; other factors may have a modifying effect. A study of Tertiary bones interred under conditions of warm humid climate supports the interpretation of climatic control as does the regional pattern of iron content in bones of Upper Miocene of North America.

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