MEMOIRS 



OF 



THE GEOLOGICAL SURVEY OF INDIA 



Notes on the Geological Structure of the Chitiehun region, by 

 Dr. Carl Diener, Professor of Geology at the University 

 of Vienna. 



Mr. Griesbach 1 has shown that the structure of the Chitiehun area 

 corresponds, roughly speaking, to a complicated synclinal, formed by 

 Spiti shales and Gieumal sandstones and bordered on three sides by 

 triassic folds, " namely, the range which runs from the Lahur to 

 Chidamu on the west, the high peaks and ranges which form the 

 Chitiehun No. II (19,550 feet) and Dharma peaks on the south, and 

 the long ridges, with fine precipitous cliffs, which extend from the 

 Chanambaniali peaks (18,360 feet) to northwards, and shut off the 

 Chitiehun ground from the widely extended hilly area, chiefly formed 

 by mesozoic rocks, which are seen to stretch to north-east and north 

 towards the Sutlej river." 



Although the bedding of the mesozoic strata comprising the 

 Chitiehun area is considerably disturbed and much crushing, 

 especially in the Spiti shales, may be observed locally, they all form 

 an apparently normal sequence, without any distinct unconformity 

 or break between them. 



Jurassic beds. — Between the mighty system of upper triassic lime- 

 stones and dolomites (Griesbach's rhaetic system), which are the Hima- 

 layan representatives of the Alpine " Dachsteinkalk " (in the sense 



1 Records, XXVI. pp. 19—25. 

 B ( I ) 



