124 MIDDLEMISS: PHYSICAL GEOLOGY OF SUB-HIMALAYA. 



as a rule, beneath those of younger age, that is to say, towards the 

 present region of deposition. Here on the margin of the Himalaya 

 we have the structure imbriquee ; we ascend from the plains over 

 blocks of strata all dipping away from the present region of deposition, 

 and, though each step or disturbance zone is older as a whole, the in- 

 dividual members are arranged in the opposite manner to what they 

 are in England. There is no parallelism, there is no compromise, 

 between the two countries ; and the deduction that sober reasoners 

 will draw from this is that either the nature, or the amount, of their 

 disturbance must be very different. 



Some other points of general importance may now be noticed. 



Nature of the uncor, In describing the country to the south of the 



formability between the Sanp-uri sot I mentioned the occurrence of upper- 



Siwalik conglomerate ° rr 



and the Nahans, south most Siwalik conglomerates in most palpable 

 of Sanguri sot. f 



unconrormabihty on the up-turned edges of 



lowermost Nahans. A similar relation is also seen on the north and 

 east sides of the Kotah dun and north of the Sa*ra N. In other parts 

 of the country, for instance, in the Rcimganga-Pelcini section, I pointed 

 out a normal ascending series of strata without break from the base of 

 the Nahans up to the top of the Siwalik conglomerate. 



From the very many excellent river sections that I have observed 

 I cannot persuade myself that this ascending series is anything but 

 regular and conformable, and I think it unnecessary to assume, as 

 Mr. Medlicott has done on similar grounds, 1 that the state must be one 

 of apparent conformability only, with an undetected line of division 

 between the two. As already stated by me, the immense thickness of 

 the Sub-Himalayan deposits from the Nahans upwards, which average 

 16,500 feet in the area covered by this memoir, as well as other con- 

 siderations, imply a long epoch of time ; so that there is no anomaly in 

 imagining their continuous deposition along one line, and a gradual 

 and simultaneous crushing up of them along another adjacent line. In- 

 deed, the evidence of the progressive and successional folding and fault- 

 ing that have taken place throughout the Sub-Himalayan zone leads 



1 Mem. Ill, G. S. L, p. 104. 



( '82 ) 



