50 M1DDLEM1SS: PHYSICAL GEOLOGY OF SUB-HIMALAYA. 



N.E. in places, though varying a good deal. There are a few 

 banks of Recent gravels along the margin of this reach. There is no 

 turning over of the dip towards the plains as we near them, but a 

 continuous ascending series from them to the Nahan-Siwalik fault, 

 which must represent the northern half of an anticlinal fold ; the south- 

 ern half having no hilly representative at all, probably on account 

 of its early disappearance by reflexing and fold-faulting (see sec- 

 tion V). 



Denudation therefore has made much more impression on the 

 country here than on that of the Kotah dun. The strata also show 

 more lateral compression, and orography is not so entirely dependent 

 on disturbance for its distinguishing features. The development of a 

 slightly reversed fault between the Siwalik conglomerate and the 

 Nahans, in place of the mere bend in the Kotah dun, is another point 

 evincing greater compression. As compared with the lower reach 

 of the Kosi, there is a return to the normal direction of distur- 

 bance, namely, along lines running W.N.W. and E.S.E. Neverthe- 

 less, in most of the small streams in this part near their debou- 

 chure on to the plains, there may be noticed a slight tendency 

 of the direction of dip to vibrate on one side or the other of the 

 normal direction, thus hinting at a disturbance, at right angles to the 

 normal one, of the same nature as, but less intense than, that which 

 produced the lateral shift and north and south folds in the Kosi. 



Travelling in a westerly direction along the foot of the hills from 



the Sawaldeh Rau, we find numerous other 

 Khasaria (Ringola-ka) 

 s6t (24). streams flowing in much the same manner and 



s6t)(25). ' a generally in a southerly direction, named as in 



tr ™es g L™ Heri the margin. They take their rise also from the 

 (Haiii) Rau.the Suk Rau ame ridge f Siwalik conglomerate and cut 



and the Choti Koti Rau & & 



(Jumnu gadh) (26). entirely across the sand-rock strata. The coun- 



Koci Rau with its tri- . . 



butanes the two Maun- try they traverse is merely a continuation of 

 pam ' that further to the east. It is lowest near the 



base of the conglomerate scarp, where the streams have widened their 

 beds, and left some Recent gravel deposits in their vicinity. As they 

 near the plains the dip increases in height, and with it the general 

 ( 108 ) 



