GEOLOGIC 

 ERAS PERIODS 



I Receat 



.2 p^^\ Pleistocene 



S ,<o g I Pliocene 



§ ■S ^ ; Miocene 



^^ H 3 ; Oligocene 



O i Eocene 



i Paleocene 



" Cretaceous 



MILLIONS' FIRST APPEAR- 



OF years! ance of new 



AGO i TYPES OF UFE 



o 



o 



Ccmamchean 

 Jurassic 



Triassic 

 Permian 



O Petmsylvanian^ 



Modern man 

 Primitive main 

 Man-like apes 



60 Primates 



Placental mamnjals 



j 



135 i 



DOMINANT LIFE FORMS 



^Z-. 





U-. 



Marsupials 



180 Mammal-like 

 reptiles 





4«-,^_, :u« 



^^ 



'■>r-^-)^^ 





\ 



%".. 







• r\ 



(T' 



Primitive reptiles \ 



^'^: S:'~=^- 



Amphibians 

 Fishes 



Fish-hke 

 vertebrates 



•^ 





Invertebrates 



2. o 





ivV 





", r t; r^Anw 



NEW LIVING TYPES IN SUCCESSIVE DEPOSITS OF THE EARTH'S CRUST 



