XII 



LIFE OF TERTIARY PERIOD 



229 



of some of the later forms. After these come the Tetra- 

 belodons from the Miocene beds of France and North 



Recent 

 Pleistocene 

 Upper Pliocene 



ELEPHAS 

 (short chinj 



Lower Pliocene TETRABELODON 



[longirostris stage] 

 Upper Miocene (shortening chinj 



Middle Miocene TETRABELODON 



("ANGUSTIDENS STAGE] 

 Lower Niocen e ( long chin) 



Upper Oligocene M W"t™nfrom Africa 



into Europe -Asia 



Lower Oligocene: 

 UpperEocene 

 Middle Eocene 

 Lower Eocene 



PALAEOMASTODON 

 (lengthening chin) 



MOERITHERIUM 

 (short chin) 



Fig. 82. — Diagrams showing Increase of Size and Alteration in 

 Form of Skull and Teeth of the Proboscidea since Eocene 

 Time. (B.M. Guide.) 



