Fig. 191. 



Fig. 192. 



Fig. 191 — The " pocked " surface characteristically developed in the zone of light 

 nivation. Compare with Fig. 194, showing the effects of heavy nivation. 



Fig. 192 — Steep cirque walls and valleys head in the Central Ranges between 

 Lambrama and Chuquibambilla. The snow is here a vigorous agent in transporting 

 talus material and soil from all the upper slopes down to the foot of the cirque wall. 



