THE ORIGIN OF DERHVSHIRE SCENERY. jgo 



that as the jointing planes are inclined at a high angle to the 

 horizon, the eastern bank will become precipitous, the western 

 bank gentle. 



In A the river is shallow and broad. In b it has deepened 

 and become narrower, encroaching up.n its eastern bank. At c 

 and D the process has continued still further, sand and gravel 

 (alluvium) being left at a and a' on its western bank. Many of 

 our Derbyshire valleys well illustrate this. Take only the Matlock 

 Valley at Matlock Bath. Here the course of the river is tortuous. 



Fig. 7 IS a section across the valley, and may be compared with 

 Fig. 6 which is an ideal section. The section also exhibits the 

 superior resisting power of the millstone grit which forms the 

 cappmg of the hill on which Riber Castle is built. The effect of 



the joints on scenery is still more plainly seen in the diagrammatic 

 sketch, Fig. 8, where the fissure of the High Tor Cavern is shown. 



