Chap. IV.] nahun and sivalik groups. 1S3 



division of the series, intervening between the Nahun group (bottom 

 Sivalik) and the Subathu group. 



Between Kalka, where the group consists of but a narrow band 

 forming a low, flanking ridge, and the Sutlej, where it is sixteen 

 miles wide and forms several ridges separated by well-defined fissures, 



K t f h"ll t f there is a complicated knot of hills east and 

 Nalagurh. north-east of Nalagurh, in which the flexures and 



fissures of the region to the north-west take their rise. The irregularities 

 of strike in this area can only be reduced to some order by tracing back 

 into it the leading flexures as developed to the north-west, the complexity 

 being apparently due to the mingled effects of the general disturbing 

 force, and the influence upon it of the oblique surface of resistance of 

 the Lower Himalayan mountain-mass : the lines, which in the open area 

 between the Sutlej and the Beas have a remarkably regular general run to 

 south 35° to 40° east, become deflected more to the south in the vicinity 

 of the higher hills. A short way to the east of the Sutlej, along 

 the road from Roopur to Belaspur, there are but two distinct ridges of 

 hills. The outer one is formed of a principal anticlinal bend, occupying 



„ , , , -r, , the crest of the ridge, but there are several minor 



Kundulu and Belas- ° 



poor section. features which are more distinguished elsewhere. 



There is a well-marked longitudinal synclinal fold at the lower 

 end of the Kundulu lake ; it curves round into the projection of 

 the range over Nalagurh on the east, where it flattens and 

 vanishes. Between the lake and the crest there is a wave in the 

 general west-south-west dip, indicating an anticlinal and synclinal fold ; 

 these are the beginnings of the deep flexures to the north-west. The 

 rocks here are of the harder, lower type, and clays are abundant 

 Along the crest the dip turns over abruptly at the main anticlinal, and the 

 great unbroken sheets of rock, standing up nearly vertically, give a very 

 rugged aspect to the north side of the ridge ; this is a very common feature 

 in these hills. The rocks here are very thick, coarsish, softish sandstones. 



