324 



HISTORICAL GEOLOGY 



S/epAas '/a 



Sfeoocton ; /s 



Mastodon fa 



RECENT 



PLEISTOCENE 



UPPER PLIOCENE J 



LOmPLIOCENEyiomphothenum 

 \ /ontjirostris stay. 



UPPER MIOCENE j ^'^ 



TfWOLE MIOCENE \ 



MifoTion into I Gomphotherium 



North Africa \ Q jZfaU 

 Tetrabeiodon '/* LOUER MIOCENE) 



UPPER OLWCENE 



L0Vff?0L/60CENE\ 



Yra/aedmastodt 

 Poloeomastodor, 'fy UPPER EOCENE I {l^fhu,!n ? chin*) 



| Moer'iJhenum 



MIOOLE EOCENE ) Q**tf&) 



. Moerit/ier/um fa 



? L OWfA EOCENE (ancestor unknown^, ? 



Fig. 203 

 Chart to illustrate the evolution of the Elephants. (From Scott, 

 after Lull, modified by Sinclair, by courtesy of The Macmillan 

 Company.) 



