DESERTS. 
i) 
“I 
on 
THE ZERAFSHAN VALLEY. 
On the Northern Pamir and in the Alai valley we found a good field for glaci- 
ology, and would, off-hand, expect to find record of corresponding climatic change 
on outlying ranges, nearby members of the Tian Shan. But although no such 
extreme difference as the variation of from one to six glacial epochs, found by 

Fig. 452.—Thatched Roofs in the Sardai-miona Gorge. 
Mr. Huntington, was met with on my journey, there was an unmistakable discord- 
ance between certain valleys. We hope to show that a differential glacial record 
was inevitable on mountains subjected to the differential uplift such as we find 
recorded by various degrees of block-faulting and tilting. With the Alai Moun- 
tains, we have a region that has ats 
been uplifted some thousands of i | 
feet, faulted on the north and bor- | 
dered there by rows of uptilted | 
piedmonts. It isa significant fact 
that Mr. Huntington found a uni- 
versal correspondence of variations 
inclimate (by attributing valley ter- 
races to climatic change) and yet 
no correspondence at all between 
vailey glaciers. Wecan not, how- 
ever, believe that the glaciers of 
Central Asia were independent of 
Central Asia’s climatic change. If 
it were merely a disagreement be- 
tween valleys of different elevation, 
between high valleys now occupied and low ones now glacier empty and between 
empty valleys of different height, the matter might be argued independent of 
uplift. But such is not the case. Out of twenty-four valleys scarcely any two 
of the same height agree; and there are instances of valleys near together and 
of the same height disagreeing several epochs. It will be understood that most 
= ee 

Fig. 453.—A Sled in the Hissar Valley. 
