Chap. IV.] nahun and sivalik groups. Ill 



still in the same direction, in the precipitous bank of the immediate 

 -river- valley, the same beds are quite undisturbed; Fig. 16 represents 



Fig. 16. 



s^^ 



Sivalik range. . Nahun eange. 



Section at Simbuwala. 



the section here. Examined independently in this locality, or, as 



better exposed in the banks of the Batta, these conglomerates would 



inevitably be looked upon as recent valley deposits. I cannot, however, 



but consider them as of true Sivalik age, — as partly deposited prior to, 



and partly cotemporaneous with, the disturbance now so extensively 



exhibited in the rocks to the south ; the identity of the two deposits is 



complete, as is also the gradation of disturbance. 



If the interpretation I have given of this last section be correct, it 



enables us, in conjunction with that of the Tib section, to exhibit an 



important point, — the commencement, and even the extensive progress, of 



-o , , , e the contorting action prior to the Sivalik period : 



Jrrotracted process of ox r 



contortion. £ or y. mus t j^ supposed that the inner band of rocks 



north of Simbuwala had been greatly tilted before the conglomerates 

 were laid against them. We will find evidence in other sections (as in 

 the Sutlej and Sursulla) that the same forces were in action subse- 

 quent to the deposition of the same conglomerates. We are thus com- 

 pelled to distribute the resultant effects over an extended period. Such 

 in fact is the general impression made by the study of the Sub-Hima- 

 layan zone, namely, the continued action of a general disturbing force, 

 the effects of which were varied in time and place by local conditions. 

 I have taken the earliest opportunity to notice the junction about 



Importance of the Tib Tib > beCaUSe * belieVe i<J t0 aff ° rd a ke ^ to man y 

 sectl0n - others : it is in the nature of the case that this 



clue should be found in the relations of the most recent rocks. The 



