130 SUB-HIMALAYAN ROCKS OF N. W. INDIA. [ClIAP. IV. 



rocks, and are more thoroughly water-worn. On the left bank of the 

 Noon this conglomerate caps the hill of Kungora Daen at a higher level 

 than the top of the terrace. Seams of brown and of ochreous clay occur 

 sparingly with this conglomerate. There is, of course, a greater proba- 

 bility in the case of this lower or Kungora conglomerate that it may 

 belong to the uppermost Sivalik deposits. 



I need scarcely say how important are the bearings of the interpre- 



, . tation we put upon the Noon section. For a 



General remarks upon r 1 



Noon section. portion of it I consider there is no option but to 



look upon it as an inversion of Sivalik rocks ; and it may fairly be asked 

 why should we not adopt it as the type section, instead of those in the 

 region about Nahun, where we have independent evidence for thinking 

 that peculiar conditions obtained. The general section (Fig. 2, p. 18) 

 sufficiently illustrates the interpretation provisionally adopted for the 

 outer portion of the Noon section, — the supposition that there is a geolo- 

 gical boundary at Suntour Gurh, as shown in the map. Even this view 

 is a very Considerable modification of the Nahun sections, and there 

 is at least equal reason for adopting it as a type. We might 

 indeed apply this explanation to the Nahun sections themselves. 

 We might suppose lower members of the Sivalik series, conformable 

 in the general section of the Sivalik hills, turned up on edge near 

 the Nahun junction, and there overlaid transversely by the top conglo- 

 merates, which in turn underwent contortion. The section in the 

 Sutlej at Bubhor will fully illustrate the possibility of the case I here 

 suppose. If, however, we are to look upon the whole section in the Noon 

 as an inversion of the Sivalik series, we can scarcely avoid adopting this 

 supposition for the whole Sub-Himalayan zone, at least of the eastern 

 region, and we must modify our views accordingly of the main boundary ; 

 it would then become a more defined locus of contortion than I have 

 suoposed it to be. The general argument I have advanced against this 

 boundary being a great master-fault seems to me valid against the 



