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THE POPULAR SCIENCE MONTHLY 



rocks, or sandy clays and shales, of which the hills are composed, are 

 interstratified with occasional harder beds, the slopes are terraced ; 

 and when these thinly-bedded, though harder, rocks prevail, the ont- 



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lines of the topography are changed, and present angular surfaces, and 

 give rise to another type of topographic features, which I have de 

 nominated Alcove Lands, 



