Bowman — Geologic Relations of the Cuzco Remains. 317 



west of Cuzco.* In many valleys glacial features are devel- 

 oped at a much higher level. In other valleys outside the 

 Cuzco basin the limits of glaciation are much lower. For 

 example, between Ollantaytambo and Torontoy, well-developed 

 terminal moraines at least 400 feet high stand but 8,500 feet 

 (aneroid) above sea level. 



Besides stride the glaciated valleys exhibit slopes of character- 



FlG. 11. 



Fig. 11. Glaciated head of the Chacimayu valley. Note the smooth floor 

 and steep sides. Looking up-valley from station in which fig. 12 was taken. 



istic pattern. Fig. 11 represents the glaciated head of the 

 Chacimayu ; fig. 12 represents the unglaciated lower and 



* Near the fortress of Sacsahuaman, north of Cuzco, is a famous grooved 

 and striated knob of rock. The remarkable nature of the grooves has often 

 been described though never properly interpreted. Proof that the surface 

 was slickensided and not glaciated will be presented in a later paper on the 

 geology and geography of the Cuzco basin. 



