CHAPTER XIX 



THE GEOLOGICAL RECORD 



THE table given below expresses the chief of the Periods into 

 which the geological history of the earth-crust is divided, and their 

 grouping under three great life stages, the Eozoic, Palaeozoic, and 



ERAS. 



Neozoic 



SUB-ERAS. 



Cainozoic 



Palaeozoic 



^Mesozoic 



'Deuterozoic 



.Protozoic 



Eozoic . 



PERIODS. 



fPleistocene. 

 Pliocene. 

 Miocene. 

 Oligocene. 

 .Eocene. 



[Cretaceous. 

 j Jurassic. 

 iTriassic. 



fPermian. 



[ Carboniferous. 



[Devonian. 



fSilurian. 

 j Ordovician. 

 I Cambrian. 



/Torridonian. 

 I Longmyndian. 

 1 Dalradian. 

 ILaurentian. 



Neozoic Eras. Of the life of the Eozoic era practically nothing is 

 known, but there is evidence to show that life had dawned on the 

 earth at least before the end of the Era. The life of the Palaeozoic 

 is strikingly old-fashioned and very different in every particular 

 from that now existing. At first there were no vertebrates, and 



when these appear they are slowly succeeded by amphibia and 



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