Chap. IV.] nahun and sivalik groups. 151 



the sections of the several feeders of the Chukkee and of the Dairhh. 

 In fact, though I have represented the zone as continuous on the map, 

 I think that the soft, reddish-brown sandstones and [clays, with some 

 bands of conglomerates (containing Sub-Himalayan debris), forming the 

 narrow band separating the massive conglomerates from the trappean 

 rocks, between Sihunta and Choari, belong to the same group as the 

 massive conglomerates themselves. On Buklo ridge we have again a 

 fuller section of this inner band of lower ■ rocks, but it might well be 

 asserted that they are only the same beds as are found regularly under- 

 lying the conglomerates in the sections to the south. The case here is in 

 fact completely analogous to that already discussed between the Nahun 

 and the Sivalik zones of the eastern regions. 



The point of most evident importance in this western district is the 

 determination of the degree of equivalence of the similar beds in the 

 uppermost portion of the successive zones. The relation of the top beds 

 to the underlying strata, is a question common to the whole Sub-Hima- 

 layan area. The successive disappearance of the two outermost ranges 

 to the north-west is of considerable interest. It is not quite apparent, 

 moreover, whether denudation may not be the chief cause of this ; there 

 is certainly no decrease of disturbing energy in the section at Hoshi- 

 yarpur as compared with that at Pinjore. Such a decrease is very 

 marked indeed in the second zone, between the sections at Una and 

 at Gungot, but until the precise relations of the upper Sub-Himalayan 

 groups in this region be more closely made out this comparison is not 

 admissible. 



