CHRONOLOGICAL SUCCESSION. 



43 



Ideal Section of the Crust of the Earth. 



Fig, 17. 



)o Post-tertiary and Recent. 

 Pliocene. 



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7^>^;^= 



^^ii-:.^,,. 





JLTJ. 



j~r^ij~ 



i^: 





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1 



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^ 



^.= 



s 



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c _ c C 



f r 



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2_c c^_g,4^;^ 



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Carboniferous. 



Devonian or Old Red Sandstone. 



Silurian. 



Cambrian. 

 Huronian. 



Laurentian. 



