THE KOTAH D#N. 



35 



composed of horizontal Recent beds of gravel and clay, which seem 

 to be sticking to the sides of the bank. A little south from this point 

 I was astonished to see what appeared to be those upper gravels and 

 clays dipping S.S.W. at an angle of 30 . The lower portion of 

 the bank was here much obscured by talus, but at intervals I could 

 still make out nearly vertical conglomerates just visible above the 

 river-bed. I was immediately impressed by the belief that there must 

 be here a set of inclined gravels and clays, of younger age than the 

 Siwaliks, and superposed uncomformably upon them. I could see no 

 way out of this interpretation for some time, until I worked up stream, 

 when I made out the points illustrated below — 



S.S.W. 



N.N£ 



\\"Y\\\\\\ltl((Ull(lll(('/// 



100 



B 



90' 



60 



B' 



30 



At A and B was the supposed unconformability between the inclined 

 gravels A and nearly vertical Siwalik conglomerate B. But since A 

 and A' were continuous, B and B' also continuous, and so also A' and 

 B'; we have (using = in the sense of conformable or of the same 

 age) — 



A = A' 



B = B' = A' 



Therefore A = B 



I came to the conclusion, therefore, that the beds at A and B were of 



the same age. I then set to work with coolies to pick away the 



section. I was rewarded by finding the loosely aggregated gravels 



becoming firmer as the material was cut into, and by also finding the 



upper beds at A bend round rapidly to the vertical, and so become 



actually continuous with those at B. I have taken the pains to 



describe this carefully because it is an example in miniature of what 



C2 ( 93 ) 



