EVIDENCES— GEOLOGY 



137 



C 



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 v^ c 



o 15 



S.5 

 < 



Q. 



3 



o S 



B 



Cenozoic 



Mesozoic 



Permian 



Carboniferous 



Devonian 



Silurian 



Cambrian 



Archeozoic 



Fig. 75. — Diagram of the evolution of the major groups of Arthropoda. 



(Modified after Handlirsch.) 



