296 



THE EVOLUTIONARY CAREER 



^ Different methods give rather different results. Still the general similarity 

 of order of magnitude is encouraging. 



The table represents the durations of time occupied by the 

 deposition of the various systems of stratified rocks, Recent, 

 Phocene, Miocene, etc., or included in each era — Cainozoic, 

 Mesozoic, Paleozoic, etc. The whole period of sedimentation 

 is the same as that throughout which there has been water on 



