SUBDIVISIONS OF TIME 



355 



and this would be an improvement in some respects, but the pro- 

 posal has not been carried out. 



Table of Geological Divisions 



Quaternary Period or Pleistocene Epoch 

 (■ Pliocene Epoch 



Cenozoic Era 



Tertiary 



Mi 



Cretaceous Period 1 

 Mesozoic Era \ Jurassic " 



Triassic " 



I Oligocene 

 I Eocene 



' Permian 



Palaeozoic Era \ 



Period 



Eozoic Era 

 Azoic Era 



Carboniferous 



Devonian 



Silurian " 



Ordovician " 



Cambrian " 



Algonkian Period 

 Archaean Period 



f Upper Carbonif. Epoch 

 ( Lower Carbonif. 

 C Chemung 

 I Hamilton 



Corniferous 

 I Oriskany 

 f Lower Helderberg 

 \ Onondaga 

 [ Niagara 

 jlCanadian ) 

 (^Trenton 

 flPotsdam 

 \ Acadian 

 [ Georgian 



1 The subdivisions of the Mesozoic Periods are so different for different parts of 

 the continent that thev are omitted in the table. 



