TABLE SHEWING THE RELATIVE THICKNESS OF THE 

 ROCKS IN EACH GEOLOGICAL PERIOD. 



o 



Period 



& 



Pliocene 

 Miocene 



Eocene 



Cretaceous 



Jurassic 



Triassic 



Permian 



Carboniferous 



Devonian 



Silurian 



Ordovician 



Cambrian 



Algonkian 



Huronian 



Laurentian ,, 



Man. 



Primates. 



Flowering Plants. 

 Birds and Mammals. 



Reptiles. 



Amphibians. 

 Gymnosperm Plants. 

 Fishes. 



Insects. 



Land Plants ; Cryptogams. 



Vertebrates. 



Echinodermata. 

 Brachiopoda. 



Crustacea, 

 tfollusca. 

 Vermes. 



Sponges (?) 

 p rotozoa (?) 



101 



