48 SUB-HIMALAYAN ROCKS OP N. W. INDIA. [CHAP. II 



the western termination of the synclinal axis, forming a three-sided 

 Dies out west of Suk- converging dip ; the ridge of Gharog belongs to 

 rar - the south-south-west dip of the Simla ridge, of 



which watershed it is a branch continuation. For several miles in the 

 same direction, this acute curve in the strike obtains, until at last the 

 sides of the synclinal come together, so that the reverse dips form a 

 general anticlinal down the valley of the Ulley. With this synclinal the 

 partial area of elevation terminates. It must be remembered that 

 it is only as belonging to the outer belt of the Lower Himalaya, as com- 

 pared with the country to the south-east of the Chor, that this area can 

 be spoken of as one of special elevation. We have seen in the section 

 from Simla to Hatu a steady rise in the rocks as we proceed north- 

 eastwards. 



In the valley of the Sutlej, to the north of Simla, we find a good example 

 of the deep indentations in the older rocks occupied 

 by younger strata. The south-south-west dip at 

 Simla, which to the east-north-east passes by a uniclinal, rather than an 

 anticlinal, curve into the undulating eastern inclination at Mahasu, is main- 

 tained on the north down to the Sutlej valley, through a descending section 

 of the Simla slates, or Infra-Blini series. A strong band of slightly mica- 

 ceous sandstone occurs at Bogora, the slates in contact being sub-schistose, 

 as is usual in such positions. On the spur from Mahasu the dip flattens 

 greatly, but soon rises again in the same direction along the ridge over 

 Basantpur. A thin band of limestone shows here on the crest, passing 

 obliquely into the valley on the south. On the north side are more 

 slates, greatly crushed towards the base. In the area represented ap- 

 proximately by the actual gorge of the Sutlej, utter confusion pervades 



the rocks ; ribs of massive limestone strike up 

 Area of disturbance. . , . 



promiscuously among slates and sub-schistose rocks ; 



there is also much trap rock. Below Suni a copious hot spring rises in 



