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Digital Archive of Toyo Bunko Rare Books
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| 0083 |
Explorations in Turkestan : Expedition of 1904 : vol.1 |
Captions
| [Photo] 16 |
Starting a Shaft in the City of Anau. |
Citation Information
OCR Text
The conditions that permitted the forming of these great thicknesses of brown
loam were apparently those belonging with a greater amount of both general
and local precipitation. They presuppose, I think, a degree of moisture that does
not now obtain, under the influence of which there was a perennial growth of grass
sufficient to allow the accretion of intimately mixed alluvial silts and loess-dust.
I imagine that the top of the brown loam at − 60 feet in the well is approx-
imately contemporaneous with the similar material under the North and South
Kurgans; and that its greater depth may roughly correspond to the depth to which
degradation extended before the refilling of the valley occurred, during which
the North Kurgan was started. The absence of the brown loess-dust constituent,
both from the upper 50 feet in the well and in the sediments deposited at Anau
after the starting of the North Kurgan, point, I think, to a diminished precipitation
over the piedmont zone, i. e., diminished sufficiently to cause a deficiency in the
growth of grass required to retain the loess-dust.
When we compare, further, the upper 60 feet in the well with the whole
of the column below, we see that there is evidence of a great change from a long-
continued different condition. And when we consider together the apparent
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