586 



G. K. GILBERT 



On the opposite side of the ridge are gentle slopes, in part of preglacial 

 origin. Perhaps all the portions visible are of that character, but 

 on that side of the ridge are also faintly developed cirques, from which 

 small ice-streams flowed toward the south. 



At still lower levels are many ridges along which Pleistocene 



Fig. 6. — Westward from Kid Peak, Sierra Nevada. The highest point of the 

 crest at left is Goat Peak. 



glaciers were developed on one side only — the north or northeast 

 side, so far as observed. The south and southwest slopes retain 

 the preglacial facies, and retain also the actual preglacial topography, 

 except for such equable reduction of surface as may have been accom- 

 phshed by aqueous and atmospheric agencies. The direction of 

 ice movement in such cases was not parallel to the ridge axis, but 

 approximately normal to it. The glacial excavation did not always 

 take the character of a series of cirques, but sometimes produced a 



