IIIF Color HighRes
National Institute of Informatics - Digital Silk Road Project
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| IIIF Color HighRes |
| Explorations in Turkestan : Expedition of 1904 : vol.2 |
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| Terraces of the Kizil Su in Karategin. |
Citation Information
DESERTS. • 267
Physiographically, the great features of this spacious valley arise from its ancient terraces and grade-plains. In general, there are three past erosion stages represented and these with the present river channel make four erosion cycles. But for over 3o miles, midway between Obu-garm and Katta Kara Muk, the third and fourth stages merge into one; or rather the third-cycle flood-plain warps under present alluviation and the river spreads out with no channel. Often the second-stage terrace is found obliterated and the valley becomes a simple wide gorge with tributaries cut into the old topography of its first stage, the pene-plain stage of these regions.
FIVE MILE SECTION NEAR HAU1.
TYPE FIVE MiLC SECTION wHERE TMIRO CYCLE FLOOD-PLAIN IS NOT WARPED UNDER THE PRESENT FLOOD-PLAIN-
Fig. 444.—Terraces of the Kizil Su in Karategin.
As the first-stage topography has been uplifted and dissected by this great gorge and all its tributary systems to a depth of from 3,000 to 4,000 feet, only limited areas of its original slopes now remain. It is to be inferred from a conformity of grade-plains and flat-topped spurs flanking the Peter-the-Great Range and dissected remnants of a one-time half-peneplained belt of the Alai Mountains north. When uplift began, it was by no means a peneplain, but rather a mature topography grading into the wide, shallow valley of the Kizil Su and peaked' here
. ••' :;•:y ~
~~_yAlluvium
1St cycle
Grade plains flanking Limestone
SECTION THREE MILES BELOW THE ALAI VALLEY.
2d c de terrace
3d and 4th cycles (Present flood plain)
_~ AIIilvlum •..
the Peter The Great Rets.
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