148 
EXPLORATIONS IN TURKESTAN. 
branch of the Amu dan-a, which is the present outlet of the Kizil Su. It seems 
highly probable that the Alai \'alley, with its great transverse moraines, may have 
held one, or even several, lakes dnrino^ glacial ejxjchs ; but a lake reaching to the 
height of our escariDUient terraces would be high above the lower passes over the 
Alai range, and, moreover, we observed no lake sediments. 
Fig. 1 1 1. — The eastern side of^lhe Sari Tash^Valley from about 5 versts]^below Katin-Art_Pass. 
It seems probable that a sinking of the Alai \'alley with the region including 
the northern side tributaries, accompanied by a fault on the southern border, would 
have resulted in the obser\-ed truncation, lowered the base of, and caused the 
deepening of, the Trans-Alai side valleys, while the part going down would have 
been filled up with waste. This fits the present conditions observed. 
Fig. I 12. — Remnants of Floor A, as seen looking down from jusi below Taldic Pass. 
OBSERVATIONS IN THE T.\LDIC VALLEY. 
Our route led us twice along that part of the Taldic dar}-a between its somce 
at Taldic pass and Gulcha on the southern border of the Fergana lowlands. On 
the waj- up a general idea of the valley fonn was obtained ; on the way down more 
detailed observations were made. * 
It will be seen on the map that this stream starts with a northeasterh- course, 
but gradually bends toward the west, and finally recrosses the meridian of its source. 
A straight line from Taldic pass to Gulcha points but a few degrees east of north. 
