22 



TRANSACTIONS OF THE 



[Sess. 



fact that every valley is broken by a precipice seems to 

 suggest faulting at some period, but there is much in the 

 sculpturing of the region that I do not understand. 



I found further evidence of the retreat of the ice on the 



^Mekong-Sahveen divide. At Doker-la, for example, a pass 



immediately to the south of the snowy range known as 



Ka'-gur-pw (an elevated part of the divide), the smoothed 



U -shaped granite valley is broken near its head by a sheer 



Forast 



Bare 

 VOcV or earth' 



oarse earth, 

 th scratched ctcnei. 



Ar.ctent moreine covered 

 with scrub and forest 



is 150 feet above C, the glacier 

 level ; B is 200 feet above A, so 

 that the moraine is 350 feet high. 



Section from N. to S. acro.=;s the glacier near its snout (diagrammatic). 



outh f^ 



Sertion a little higher 

 up the valley, show- 

 ing cliffs and crevasse 

 on N. face No lat- 

 eral morainp. 



precipice exactly like that over which the bergs fall in the 

 case just cited, and beyond this is the remnant of a glacier. 

 The shape of the valley, its sheer planed walls on which 

 certain marks like deep grooves are cut, the flat meadows 

 filled with sand (evidently once rock basins), and some 

 enormous boulders which may have been transported, are 

 clear indications of a previous extension of the ice at 

 Doker-la. Again, further north in a smaller glacier valley 

 of Ka'-gur-pw, I found a small lateral moraine tucked away 

 above the ice level, and covered with shrub growth. It is 

 evident that, where the cliffs are not sheer, small lateral 

 morain(^s can be formed, and one valley head was ahnost 



