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Digital Archive of Toyo Bunko Rare Books
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| 0065 |
Explorations in Turkestan : Expedition of 1904 : vol.2 |
Captions
| [Photo] 461 |
The Dargum Canal in the Up-warped Loess-steppe of Samarkand. |
Citation Information
OCR Text
THE UPTILTED PIEDMONTS OF NORTHWESTERN TARIM AS A KEY TO THE PAST.
In northwestern Tarim alluviation of the piedmont zone is nearly confined to that from smaller streams, while the larger systems tributary to Lob-nor traverse or cross it in channels slowly decreasing in depth downstream. If it be crossed on a trail over portions independent of these larger streams and where alluviation from smaller streams is building the playas and gravel-plains of to-day; if we proceed mountainwards over such areas, in the course of 15 or 20 miles from the edge of the great sand behind we come to where no deposition is going on, and there begin shallow channels debouching from the margin of abandoned piedmont to spread below. From there on to the mountains this ancient piedmont slopes up, ever higher, above the streams dissecting it. Riding on to this, we find its dry red silt, left prey to wind, has withered into varied and fantastic forms—a vast deflated area of flat-topped remnants ranged in rows, with wide intervening trenches that are half-choked with heaps of sand. These miniature monadnocks of deflation stand to a general level, while the trenches vary up to 15 feet in depth,
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