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0176 Explorations in Turkestan 1903 : vol.1
Explorations in Turkestan 1903 : vol.1 / Page 176 (Color Image)

Captions

[Figure] 115 Map of the Ak-Busa-Ga grass plain and stream channels.

OCR Text

 

EXPLORATIONS IN TURKESTAN.

T50

   ;;► '`   The first traces of floor A are found as long sloping spurs, projecting trans-

versely into the valley below Taldic pass. Extending down the valley, it rapidly broadens out on alluvium-covered terraces, and appears to have emerged on to a waste-

    covered piedmont plain, reach-

;

   4   ing to within 25 versts north

of the present Alai range axis.

`"r'`   This plain has now been exten-

sively dissected, and remains only in frequent flat-topped hills

figg'   p..   capped with horizontally lying

conglomerate and in the sharper

t

   i°•   tops of other hills and spurs

  • " Í i;      reaching to the proper height.
    It will be seen by the profile that it spreads horizontally to the north from the range axis

°G.   and remains in terraces and al-

luvium 3,500 feet above stream at Gulcha. There were higher

hills that rose as residuals from the alluvium covering portions of the level of floor A (fig. i i 2).

Reaching a point about 3 versts down the valley from Taldic pass, the stream emerges abruptly from its torrent gorge into the wide valley at Ak-BusaGa. The accompanying sketch map (fig. i i 5) gives a rough idea of the dimensions of the plain of the valley floor and positions of the main stream and tributary channels at Ak-BusaGa. Here we find a transitional

Vii► i !   state. The trunk stream has

~ r   'ca1e   sunk a channel 15 feet deep

  • ~ !r► ~   c   i verst

through the grass plain and into

alluvial conglomerates, while the

side tributaries pass over falls

Fig. I15.—Map of the Ak-Busa-Ga   into their gullies leading to it.

8   P   grass plain and stream channels.

Since these falls are some dis-

tance from the plain border, it is evident that these streams have not had time to

>'?'g ►   cut back into their respective valleys since the trunk channel was sunk. Passing
down through Ak-Busa-Ga outlet, we find that the grass plain is there higher above