43 



RANGE OF THE FAMILIES OF THE FOSSIL CEPHALOPODA 

 IN GEOLOGICAL TIME. 





Tertiary. 



Cretaceous. 



Jurassic. 



Triassic. 



Permian. 



Carboniferous. 



Devonian. 



Silurian. 





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STKPHKN AUSTIN, PR1NTKK, HB&TJFOADi 



