158 



THE MEANING OF EVOLUTION 



any geologist. Most of them will serve to keep very 

 clearly before the mind of the ungeological the period 

 which he is studying. Like all such tables, this must 

 be read from the bottom up. This arrangement is 

 used because the oldest rocks in the series are natu- 

 rally at the bottom and the newest rocks are on the 

 top, though occasionally a region is sufficiently upset 

 partly to reverse the order. 



TABLE OF GEOLOGICAL TIMES 



Having seen what the scientist supposes to be the 

 method of formation of the earth itself, it will be 



