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TABLE XIY. 



Systematic Survey of the Neptunian fossiliferous strata of the earth with 

 reference to their relative sectional thickness (130,000 feet circa). 



IV. Caenolithic Strata, 

 circa 3000 feet. 



Pliocene, Miocene, Eocene. 



III. Mesolithic Strata. 



IX. Chalk System. 



Deposits of the 

 Secondary Epoch, circa 



VIII. Jurassic System. 



15,000 feet. 



VII. Triassic System 



II. Palaeolithic Strata. 



VI. Permian System. 



Deposits of the 

 Primary Epoch, circa 



V. Coal System. 



42,000 feet. 



IV. Devonian System. 



I. Archilithic Strata. 



III. Silurian System, circa 

 22,000 feet. 



Deposits of the 

 Primordial Epoch, circa 



II. Cambrian System, circa 

 18,000 feet. 



70,000 feet. 



I. Laurentian System, circa 

 80,000 feet. 



