Chap. IV.] nahun and sivalik groups. 127 



accumulation of deposits at the former river's mouth ; and it may at 



least be asked if the river may not have had a more direct influence, 



if in the early stages of upheavment and contortion, the special erosion 



in the river course may not have had some influence in determining 



the position of these irregularities. Whatever view is adopted for the 



Jumna must be allowed its full force in the case of the gorge at 



Hurdwar. 



I will conclude my description of the eastern region with the section 



in the river Noon, just below Masuri ; it exemplifies 

 Section in Noon. 



fully the principal difficulties of the geology of 



these Sub-Himalayan rocks, — both those relating to the separation of 

 the Sivaliks from the more recent deposits, and also the doubtfulness of 

 separating all the rocks of the Sivalik group, as provisionally laid down, 

 from" those of the Nahun band. The upper Noon, after it crosses the 

 main boundary, flows obliquely through the hills of the Nahun band ; 

 near the junction there are a few hundred feet of thinner bedded sand- 

 stones, and a few clay beds, vertical, and greatly crushed ; then the 

 gorge contracts in the massive sandstone, having a dip of about 60° to 

 north-north-east ; the high dip lasts throughout, showing a great thick- 

 ness of this rock, to where the river turns eastwards for a short distance, 

 along the outer edge of the flanking hills under Suntour Gurh. Of the 

 many streams flowing from the Masuri ridge into the dun, this is the 

 only one in which the underlying rocks are exposed south of this limit, 

 and the succession is certainly different from what the sections of the 

 Nahun region would lead one to expect. Along this east and west reach 

 of the Noon, as in a corresponding position in the other streams, clay 

 beds are more frequent, and show an increased dip with much crushing ; 

 below them in unbroken succession, and having the same high north- 

 north-easterly underlie, we find several hundred feet more of thick- 

 bedded sandstones ; among them bands of conglomerates are then intro- 

 duced, and these gradually increase in frequency, in thickness, and in 



