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| 0062 |
Explorations in Turkestan : Expedition of 1904 : vol.2 |
Captions
| [Photo] 458 |
The Zerafshan Glacier. |
Citation Information
OCR Text
away by the river during the latter part of the second and early part of the third
cycle of erosion. It is not so easy to understand how the fourth erosion cycle
could have obliterated third- and fourth-epoch moraines without obliterating that
of the second epoch. Indeed, it seems impossible under the conditions involved.
There remain two alternatives: either local conditions were such that little if any
expansions took place, or the present glacier is greater and obliterates them. But
since the glacier is now less than 15 miles long, it seems necessary to assume that
there were local reasons why no considerable advance corresponding to those of the
third epoch of Trans-Alai and Pamir took place. It seems quite likely that our
fourth-cycle uplift of the Zerafshan glacier and its surroundings took place after
the third glacial epoch farther east, where glacial conditions may have been acceler-
ated by uplift during or before that epoch. The Zerafshan is now much more
actively cutting down than any other large stream met with, and its glacier is
advancing* as though the uplift were still in process and accelerating glacial con-
ditions also.
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