PANGONG: A GLACIAL LAKE 



613 



the beach when ice is blown ashore. The lake deposits continue 

 for long distances and clearly belong to the time of the lake 's latest 

 expansion. Farther west on the side of a small stream between 

 Man and Meruk the same features are exposed even more clearly 

 in the section of which Fig. 12 is a photograph. The top of the 

 section stands 30 feet above the lake, which lies several hundred 



Fig. 12. — Photograph of the bank of a stream near Man, showing features hke 

 those of Fig. ii, especially beach gravels broken and tilted by ice and later covered 

 by the deposits of a rising lake. 



yards to the right or north of the observer. The succession of strata 

 from the top downward is as follows: 



r 2 feet, fine beach-gravel, and cobbles deposited by the lake in its last 

 4 feet, sandy clay, presumably a shore deposit. fetreat. 



I, I foot, fine gravel, presumably a shore deposit. 



^'2) feet, finely banded lacrustine clay. 



\ I foot, white saline marl with lacustrine shells. 

 Unconformity. 

 Sh 10 feet, subaerial sands and gravels crumpled by ice. 



Apparently after the fall in the lake indicated by the strands 

 described in the preceding paragraph, the water reached a level so 

 low that subaerial fans were deposited only 20 or 30 feet above the 

 strand of today and possibly still lower. Then the lake rose. At 

 first its ice crumpled the sub-aerial deposits on the lake shore, but 



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