CONTOUR MAPS 151 



rocky precipices, and in such features the crest-lines of the hills 

 are often angular and the peaks sharp. Under these circum- 

 stances the mountain contours will usually be angular and V-like, 

 and care will be requisite to distinguish their swings from those 



FIG. 47. Contour-map of plateau incised by valleys ; " hogs backs " are also shown. 



of valleys, and to determine the position of the summits. Where 

 the slopes are very gentle, on the other hand, the contours will not 

 only be far apart, but they will pass over the country in sweeping 

 curves, even across the valleys, and again their succession will not 

 be quite easy to read. 



