OF GEOLOGICAL DYNAMICS. 105 



" causation in former epochs, by which gigantic 

 " stratified masses were sometimes inverted, or so 

 " wrenched, broken, and twisted, as to pass under 

 u the very rocks out of which they were formed. 

 " Among those who have passed away 1 may 

 " mention de Saussure ; Von Buch, Humboldt, 

 " Cuvier, Brongniart, Buckland, Conybeare, De la 

 " Becke, and W. Hopkins. Of those who hold 

 " the same views, and are now living, I may 

 11 enumerate Elie de Beaumont, D'Archiac, De 

 " Verneuil, Studer, Sedgwick, J. Forbes, Phillips, 

 " Dana, Logan, and many others. The traveller 

 " amid the Alps, and other mountain chains, will 

 " there see clear and unmistakable signs of such 

 " former catastrophes, each of which resulted from 

 " fractures utterly inexplicable by reference to any 

 " of those puny oscillations of the earth, which can 

 " be appealed to during historical times." .... 

 " Again, 1 I see in existing nature no cause of 

 " sufficient intensity to account for ordinary sedi- 

 " ments (once charged with organic remains) having 

 " been changed into crystalline masses occupying 



1 Siluria ; 1867 Edition, page 495. 



