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Digital Archive of Toyo Bunko Rare Books
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| 0043 |
Explorations in Turkestan : Expedition of 1904 : vol.2 |
Captions
| [Photo] 441 |
Alluvial Terraces in the Lower End of the Alai Valley. |
Citation Information
OCR Text
Portions of its second-epoch moraine lie apparently faulted up on the terraces of its upper, broad-trough stage. Half-way down the Alai there is an uptilted mass of alluvium jutting out from its northern side as though more complicated deformation took place. In the eastern half of the valley tributaries from the north are deeply drowned in alluvium, as contrasted with those from the south, uplifted Trans-Alai, which have been canyoned postglacially. Terraces begin to flank the Kizil Su toward the outlet of the valley; and of these the higher are, as shown above, the result of cutting down since the first glacial epoch, while the lower appear to have been since the second. By early explorers these were taken for shores of an ancient lake; but they incline gently downstream, diverging some-what above it, ascend into tributary valleys from the north as characteristic alluvial terraces, and in no way resemble those of a lake. It is, therefore, obvious that the Alai valley has suffered two distinct periods of mountain movement—
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