Chap. III.] sub-himalayan series — subathu group. 95 



north-west and attaining a maximum to the south-east ; this fact, as I 

 have said, is apparent from a mere glance at the map. Already to south 

 of the Sutlej a change has taken place from the normal state of the 

 section in the Subathu area. The limestone band, which had for so 



long formed the boundary between the nummu- 

 Mode of extinction of 

 the Subathu group on the litic rocks. and the newer deposits, makes a sharp 

 north-west. ' . r 



bend inwards. The direction of the boundary 



does not conform to this sudden turn of the inner contact-rock, so that 

 beyond this point we find the Subathu group again ; the limestone 

 ridge has thus become bounded on both sides by the nummulitic beds, 

 quite similarly to the ridge at Dundelee (see Fig. 10) ; it ends abruptly 

 at a short distance to north of the river. On the west of this ridge, the 

 bottom, fossiliferous beds scarcely appear at all, and to north of the 

 Sutlej they are not to be found along either boundary, although, as 

 before, both these boundaries are lines of denudation. In the central 

 part of this Trans-Sutlej area however, north of Dihur, the soft bottom- 

 beds are well exposed in several places ; but in this position also, we 

 soon lose sight of any recognizable rock of the Subathu group. The 

 sandstones forming the Sid hill may be true representatives of the 

 Kasaoli beds, but they have an equal resemblance to beds that cannot 

 hold that pretension, and a little further in the same direction, at and 

 north of Mundi, rocks come in of so decidedly new a type that 

 I prefer describing the whole in connection with the upper groups 

 of the Sub-Himalayan series. The fact which I now wish to elu- 

 cidate is, however, independent of any strict identification of these 

 new rocks ; for if they do belong to the Subathu group they are 

 very topmost beds ; and as to the other part of the evidence there 

 can be no doubt, — the whole group is here so depressed, that the 

 bottom beds never once show again to east of Kavee, although the 

 rocks are everywhere greatly disturbed ; whereas to east of the Sutlej 

 the very base of the formation is exposed throughout. 



