90' SUB-HIMALAYAN ROCKS OF N. W. INDIA. [ClIAr. III. 



On the south-east the mode of disappearance of the Subathu beds is 

 the very reverse of what we have just seen to the 



Cutting out of the 

 Subathu group on south- north- west. For a long way before the final extinc- 

 east. 



tion of the group the bottom beds become more and 



more exposed, and at last none others are seen ; their last appearance 

 is at the top of the ridge. The final thinning out of the group is 

 however too rapid to be due simply to the general rise I have de- 

 scribed. From a little below the confluence of the Jalar and Giri the 

 boundary slopes obliquely but rapidly up the ridge to the south ; I 

 do not believe it is a fault ; the Blini limestone and conglomerate 

 are well seen both in the river and on the ridge about Pagad ; and, as I 

 have said, the full thickness of the nummulitic beds seems to be exposed 

 along the crest of the ridge. To this more rapid elevation of the area 

 at this point the abrupt termination of the Subathu group is due. Al- 

 though no sign of such a movement be traceable in the Nahun rocks on 

 the south of the main boundary, it is quite intelligible that it may have 

 occurred subsequently to, or synchronously with, the supposed great fault 

 along the boundary, and have stopped out against it. It seems however 



_ , ,, , . to me much more likely that this easterly eleva- 



Probably anterior to j j 



Nahun period. ^ on took pl ace long, anterior to the Nahun period, 



and extended far to the south of the present boundary, that the denu- 

 dation, which followed or accompanied this elevation, removed every 

 vestige of the Subathu group from off the area to the south of the main 

 boundary, and thus prepared the ground for the subsequent deposition of 

 the Nahun rocks. The state of the small outlier of the nummulitic 

 rocks east of the Ganges corresponds with the supposition I have advanced. 

 It is well elevated on a base of the Himalayan rocks. 



There is an argument I must not omit, although, being based upon 



Irregular form of this an assumption, its force will depend upon the 

 boundary an assumption 

 against a fault. theoretical convictions of each individual. The 



very irregular form of this boundary is much against its having 



