272 DENUDATION OF THE CHALK AND WEALDEN. [Ch. XIX. 



The space here inclosed within the escarpment of the chalk affords an 

 example of what has been sometimes called a " valley of elevation" 

 (more properly " of denudation") ; where the strata, partially removed by 

 aqueous excavation, dip away on all sides from a central axis. Thus, it 



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