THE AGE OF MAMMALS 



CENOZOIC UH TfcRTlAHY AND OUATI UNARY 



WESTERN LAKE BASINS and CHARACTERISTIC MAMMAl.h 







PUISTOCEN; 

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OLIGOCENE 



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UINTATHERES 



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LAST COtvnOOONS MRS! > » 



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AMBLYPOOS CORYPHODON 



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