(i77) 



Cenozoic 



Cretaceous 



100- 



Jurassic 



^5 



Triassic 



Perm/an 

 200 



Carbonifcrou. 



, t ha 



,. .„, Torpedo- 



II. HIP 





AcMtnedu ^V^vxi L I f) 







Silurian 





S. * 



DieiroleP'i 



Ordoi/iaan 



400- 



Cambrian 





FlG. hi. The early evolution of vertebrates. 



