6i4 ELLSWORTH HUNTINGTON 



later, as the water rose higher, it planed off their surface and depos- 

 ited upon them locustrine clays and marls. 



If the stream whose banks are illustrated in Fig. 12 be followed 

 upward, a section is found hke that shown in Fig. 13, which is typical 

 of the southwest side of the lake. The large moraines (3) belonging 

 to the first glacial epoch after the retreat of the ice from the main 

 Pangong basin form a ridge from 100 to 1,000 feet above the lake. 

 In one of them a valley has been dissected and has been fihed with 

 ordinary schistose talus (T) from a ridge near by. The talus passes 

 gradually into the subaerial sands and gravels (Sb) of the lower 

 parts of the sections described in the preceding paragraph. The 

 next deposit is a layer of lacustrine clays (Lc), lying on a smooth, 

 wave-swept surface. On top of all Hes a series of beaches (B) 

 formed by the lake in the course of its last contraction. Moraine 3 



Lc^ka 



Fig. 13. — Cross-section from Lake Pangong to the summit of the mountains on 

 the south shore of the lake near Man. 



5t' = Beaches. Zc = Lacustrine deposits. 



£/ = Bowlders. If^, 4, 5 = Moraines. 



G/= Glacier. 56 = Subaerial fluvial deposits. 



2" = Talus. 



appears to be synchronous with the 200-foot lake, and to have been 

 dissected during the succeeding interglacial epoch when the lake 

 stood as low or lower than at present. The moraines 4 and 4', 

 intermediate in size and age between the present moraine, 5, and 

 the older moraine, 3, are apparently synchronous with the last 

 expansion of the lake, when it rose 60 feet above the present level, 

 crumphng the beach by means of drifting ice and depositing the 

 lacustrine strata Lc of the last three sections. 



The evidence of this last rise and fall of the lake is very abundant, 

 and has been described by Drew and others. From a height of 



