144 SUB-HIMALAYAN ROCKS OF N. W. INDIA. [CHAP. IV. 



gray pebbly sandstones, and the bottom beds of the conglomerates. 

 West of the Beas this range becomes the outermost zone of hills. It too 

 flattens out into a low expanse of hills, east of Puthankot, and so comes 

 to an end before reaching the Eavee. At Tangoo hill, two miles south 

 of Puthankot, and the most westerly point of the Purwain ridge, a 

 deep cut has been made through the ridge to divert the course of 

 the Chukkee stream, showing an excellent section of brown clays, and 

 gray gravel with small boulders, having a very steady dip of 30° to west. 

 In the low hills all round very similar strata are found, showing little or 

 no disturbance, and probably belonging to the recent plains' deposits, over- 

 lapping a denuded surface of Sivalik strata ; the many instances, however, 

 we have seen in the Sivalik rocks of sudden change from original hori- 

 zontal position to one of extreme displacement should make us cautious 

 in interpreting observations of this kind. 



From the Sutlej nearly to the Beas- the whole compression of the band 



„ , . * .-l a i between the Gumber fault and the Koseree fault is 

 Extension of the Sola- 



Smghee flexure. concentrated in the complicated, faulted flexure of 



the Sola-Singhee ridge. Beyond this ridge, in both directions, the Budsur 

 fault passes into an anticlinal axis. On the south-east it is in continua- 

 tion with the axis of the ridge north of Kundulu ; and to the north-west 

 it passes into the anticlinal axis, which is first distinctly seen in the 

 ridges between Jualamuki and Deihreh, whence it can be followed 

 without interruption to the Ravee, where it appears along the north base 

 of the Dulla ridge ; at almost every point there is more or less of faulting, 

 with a northerly down-throw ; and on the south there is a general 

 tendency to a recurrence of high opposing dips, thus retaining a consi- 

 derable resemblance to the section at Budsur. At Nurpur there is a 

 strange variation in this feature, appearing on the map as a regular 

 southerly sweep of the line. The beds on the north of the axis become 

 extended, curving over so as to complete half the arch of the anticlinal. 

 It is on the flat back of this arch that the town and fort of Nurpur are 



