Page:Popular Science Monthly Volume 7.djvu/402

386 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 ontlines



of the topography are changed, and present angular surfaces, and give rise to another type of topographic features, which I have denominated Alcove Lands,