THE PROBLEM OF THE LIZARD EOCKS. 



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k 



In Fig. 4 we have the same anticlinal and synclinal folds 

 after exposure to denudation, showing in mountain peaks; in 

 Fig. 5 the axis is considerably inclined ; and in Fig. 6 is again 

 laid so low as to bring the inverted layer once more into a 

 horizontal position in the escarpment of a mountain side. 



This may be called the A B C of mountain structure, and 

 is, of course, familiar to every practical geologist, nor is it 

 difficult to follow, even by the unitiated, but it must be added 

 that the diagrams show the effects of the movement in one 

 direction only, and once only, whereas the movement may be 

 repeated indefinitely and from varying directions, and thus lead 

 to the most perplexing complications. 



FIC 8 



The pressure may further be so violent or j)rolonged as to 

 double up an originally horizontal layer upon itself, producing 

 a bunch as in Fig. 7 ; and further pressure will force into the 

 same position the second underlying layer, and actually cut off, 



