GEOLOGICAL CHRONOLOGY OF LIFE. 



After Prof. C. A. White. 



Invertebrates. Vhrtebrates. 



Plants. 



Modern 



Tertiary 



Cretaceous 



Jurassic 



Triassic 



Permian 



Carboniferous 



Devonian 



Silurian 



Ordovician 



Cambrian 



\ Etchemini 







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

 as represented in the diagram. 



