DISTRIBUTION IN TIME. 



153 



Ideal Section of the Crust of the Earth. 



o 

 o 



< 

 )4 



u 

 o 

 o 



CO 



o 



S) 



O 

 < 



PL. 



fig- 39- 



I'ost-Tcrliary and Recent. 

 Pliocene. 



'^^yzr-'.'zsl )p Miocene. 



Eocene. 



.'_'L — j'^ .•!_ 1 L_ :'--_■' — [ 



Crjlaceous. 



■=• Oolitic or Juiassi 



assic 



II n 11 I' . I' II II ti 



II li li li il il II II u M 



JO COocQOC'fOU OQ 0° o O » 





" , 11, , II , II ,11, 



:l I! II li II II 11 ll II II 

 II I I I! il I' II ' I I '11 It" I I ' 



Silurian. 



Triassic. 

 y? Permian. 



Carboniferous. 



Devonian or Old Red Sandstone. 



nan. 



Iluronian. 



Lauren tian. 



