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0153 The Pulse of Asia : vol.1
アジアの鼓動 : vol.1
The Pulse of Asia : vol.1 / 153 ページ(カラー画像)

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doi: 10.20676/00000233
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important as showing that in times past, under different
conditions, the same regions were more favorable to life. In
the eastern part of the plain, widespread deposits of broken
and blistered salt, and beds of variegated clay, proclaim that
long ago the lake of Lop-Nor was much larger than now.
Farther west, the waste of sand known as the Takla-makan
desert illustrates the work of the wind. Acting upon the
materials deposited by the streams in broad flood-plains
and playas, the wind heaps the coarser grains of sand into
an endless succession of waves. It carries off the finer par-
ticles as a hateful haze, which is finally deposited on the
mountain slopes to the south, covering them with soft beds
of loess, excellent for pasture-land wherever there is rain
enough. In many places the sands of Takla-makan have
buried the ruins of ancient villages, or the remnants of
ancient vegetation, which could have existed only when
the climate was moister than now.
Few parts of the world are so simple in structure as the
Lop basin with its marked concentric zones. In few do
contiguous regions differ so greatly and change so abruptly
in physical character, and hence in their relation to life.
The lofty, well-watered plateau zone stands like a conti-
nental ring around a sea forever dry. In their colder, more
elevated portions the plateaus are absolutely desert; but in
slightly lower regions they are covered with rich grass, and
in summer support the numerous flocks of pastoral nomads.
Sometimes the nomads pass over the edges of the plateaus,
and go part way down the long slope leading to the basin
floor. In general, however, and especially where the break
between the plateaus and the floor takes the form of a fault,