46 
EXPLORATIONS IN TURKESTAN. 
THE KOPET DAGH. 
Our intention in making an excnrsion fioni Askhabad into the Kopet Dagli 
range was to make fnrther search for any geologic or physiographic featnres in the 
mountains which miglit suggest subdivisions of recent geological time, the correla- 
tives of which could then perhaps be recognized in the more monotonous structure 
of the piedmont plain. We were fairly successful as far as the mountains were 
concerned, for indications of subrecent terracing were found in tlie valle\s here even 
more distincth- than back of Kizil-Arvat, but the recognition of the effects of the 
V7. 
ai9' 
fl A.SKABAD 
•^Arl,•^ian Well. 
Markou 
5058' 
%P'<ml^,y- 
Fig. 26. — Geological Outline Map of the Kopet Dagh, southwest of Askhabad. 
terracing in causing a change in the deposits of the plains will be more difficult. 
The changes in the mountains are made clear by a revival of activity in the streams 
in eroding their \-alle\s ; but the contemporaneous changes on the plains are con- 
cealed by the deposition of waste that the eroded mountain \-alleys have furnished. 
The excursion gave us a good sight of the structure of several ranges in a district 
that is little visited, and the results of our observations are therefore briefly set forth. 
