456 



Coombes excavated by Springs. 



on the chalk down above West Knighton. It is the coincidence of highest 

 slope directing the water, and a low point in the escarpment or range of 

 unstable beds that can be bored or undermined, owing to favourable transverse 

 flexures bringing up the beds at a convenient level, that determines the position 

 of a gorge. 5 (See page 457, Fig. 25.) 



Folkestone ia Pluvisd period tftceedfiam. ec Drawing bj 

 FIG- 24 A. r.RirrL£y. 



The springs rise in the coombes represented in Fig. 24A just above the line 

 marking the chalk marl. The size of these coombs, or of the valleys made by 

 the water issuing in springs, is the proof that there was very lately a pluvial period, 

 Fig. 23. Ecclesboum Glen, near Hastings, in the pluvial period. 





mm ft k ^t-'fe 



DENUDATION OF THE WEALD. 



When a river attacks a range of hills and passes through them, it makes a 

 passage at right angles to the direction of the range of hills, or to the strike, 

 as geologists call it. It is always so, and I would give the six Wealden rivers 



