American Early Tertiary Mammals

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THE White River formation of western North America contains numerous well-preserved fossil skeletons of mammals which date back to Oligoeene times when some present-day families were beginning to flourish. The rocks seem to have been formed by floods on a very extensive plain, where the carcases of animals which lived under varied conditions were washed together repeatedly during a long period. The fossils therefore give a very good idea of the mammals which were living on the North American continent during a particularly interesting episode in the evolution of mammalian life. They have already been described in numerous scattered works and papers, but modern methods of collecting have provided so many more satisfactory specimens that there is now an opportunity for a comprehensive review of the whole fauna.

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