TREDIAN HILLS. 271 



before the dislocation occurred. Though this is the case at Mari^ on the 

 opposite side of the river the salt-beds and red marl are directly overlaid 

 by decidedly unconformable tertiary sandstones and clays, in a way 

 which is difficult to explain by land-slip only ; and it is equally difficult 

 to imagine the thick nummulitic, the Jurassic, triassic, carboniferous and 

 " speckled sandstone '^ groups all to have died out naturally at one spot, 

 while they are each represented at distances of from two to eight miles 

 Cis-Indus, and some of them occur again in the neighbouring country 

 Trans-Indus. 



It is also as hard to suppose that such a thickness of these beds 

 can have been removed by denudation from one small tract, while the 

 softest of the whole series — the red marl, &c. — had stability enough to 

 resist that agency. 



The presence here of the great river Indus might do somethino* 

 to explain the peculiarities of the place so far as the upper (possibly 

 fresh water or lacustrine) deposits are concerned, for an original line of 

 water-discharge and removal of material might have existed here at a 

 remote tertiary period ; but any influence this could have had with reo"ard 

 to the disposition of the strata could not have obtained durino' the 

 deep-sea deposition of the nummulitic period, or during the older marine 

 conditions of the Jurassic, triassic, or carboniferous times ; so that there 

 is nothing left to be supposed but that there was here dislocation so 

 intense that the traces of the exact or progressive manner in which the 

 results were eflPected have been destroyed.* 



* If the salt-rocks of this locality could be looked upon as a newer deposit belonging 

 to the tertiary period, the general relations might be more readily understood ; but against 

 this there is their identity, in most characteristics, with the salt-rocks of other parts of 

 the range, and their association at no great distance on both sides of the river with other 

 rocks of the Salt Kange series, while the apparently newer salt beds to the northward 

 differ decidedly in colour and association from those of this locality. 



( 371 ) 



