Chap. IV.] nahun and sivalik groups. 125 



the south base an anticlinal is readily detected continuously from the 



Ganges to Paili Purao. The Bheemgoda fault makes no appearance on 



the east side of the river, the upper conglomerates being quite unbroken 



in front of it. 



The interruption of direct continuity, within so short a space, of so 



great a fault as that at Bheemgoda, necessitates the 

 The transverse break 



existence of some oblique fracture along which the 



upheaval may die out. The abrupt change of dip on the two river 

 banks points to this as the position of such a fracture. From the 

 resemblance of the general sections on each side one is inclined at 

 first to suppose the features to have been once continuous, namely, 

 the Chandi Devi anticlinal with that at Bheemgoda, and to have been 

 so separated by a subsequent cross fault. This is not, on the whole, 

 the most satisfactory view : unless it keep strictly in the bed of the 

 river there can be no such fracture, and general appearances are 

 against it. The strata of the Motichoor synclinal seem to correspond 

 with those facing them to the east of the Ganges. The Chandi anti- 

 clinal is certainly representative of that in the main Sivalik range, 

 and I suppose all these features of disturbance to have been contem- 

 poraneously produced. 



In the gorge of the Jumna, we find again a northerly dip on the east 

 Th f ,, side confronted by a southerly dip on the west, 



Jumna - and on the same strike. The dislocation does not 



appear to be so great as in the Ganges, and, the river course being more 

 winding, the opportunities for studying the details of structure are 

 better. The anticlinal axis is easily traced along the base of the Sivalik 

 range. North of it, near the Jumna, the north-easterly dip of the sand- 

 stones and conglomerates is very steady, but along a narrow north and 

 south band close to the river the beds curve rapidly round to a north- 

 westerly dip ; against this narrow transition dip the strata strike steadily 

 from the north-west and with a high south-westerly underlie. About 



