HAETLAND-MOKTVILLE SYSTEM. 



151 



mile from where we lost the osar as a two-sided ridge. It is evident that 

 the valley is filled by a rather narrow osar-plain. It extends continuously 



Fig. 17.— Map of Hogback Mountain; MonWUle and vicinity. 



for about 1 mile and then is interrupted by two or three gaps of one-third 

 mile each or thereabout. In places the erosion has revealed arched ridges 



