Fig. 179 — Snow fields on the summit of the Cordillera Vilcapampa near Ollantay- 

 tambo. A huge glacier once lay in the steep canyon in the background and descended 

 to the notched terminal moraine at the canyon mouth. In places the glacier was 

 over a thousand feet thick. From the terminal moraine an enormous alluvial fan extends 

 forward to the camera and to the opposite wall of the Urubamba Valley. It is' 

 confluent with other fans of the same origin. See Fig. 180. In the foreground are 

 flowers, shrubs, and cacti. A few miles below Urubamba at 11,500 feet. 



