GEOLOGICAL CHRONOLOGY OF LIFE. 



After Prof. C. A. White. 



Invektebkates. 



Vkrtebrates. 



Plants. 



Ghological 

 Systems 



OR 



Periods. 



CIh U W 



S < 



TO TO (U TO '^•^.— L-J^li^J^- TO 



o 



o ■{ 



1/) 



u 



Modern 



Tertiary 



Cretaceous 



Jurassic 



Triassic 



/ Permian 

 Carboniferous 

 Devonian ... 

 2 ' Silurian 



Ordovician ... 

 Cambrian ... 

 \ Etcheniinian 



N 



o 



Huronian 



c Grenvilliau 



c 



rt Archaean 



Note. — It is not supposed that the Geological Periods were of equal lengths, 

 as represented in the diagram. 



