HUMAN LIFE 



consideration of human history; to any 

 special consideration of human life from 

 the view-point of the biologist they are 

 truly essential. 



I must recall to your minds that geol- 

 ogists divide the eight hundred million 

 years, more or less, of earth time into a 

 series of successive ages characterized by 

 differing kinds of rocks and by different 

 floras and faunas, all, with the exception 

 of the flora and fauna of the present age, 

 now extinct. It is with only a few of the 

 more recent of these ages that we need 

 now concern ourselves in our search for 

 the geologic evidence of man's origin. 

 Of course, recent is a comparative term. 

 It means, in the mouth of the geologist, 

 something within anywhere from the 

 last few hundred thousand to the last 

 few million years. 



In the rocks of these more recent ages, 

 beginning with an age called Lower 

 Oligocene, and running on up through 

 Upper Oligocene, Lower, Mid and Upper 

 Miocene and Pliocene, have been found 

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