GENERAL SERIES. - 117 



origin from that previously attributed to them, and connects them with 

 the same glacial period which he believes to have left its traces in the 

 Kangia valley. 



The blocks alluded to are situated near Trapp or Trab, a village 

 eighteen miles distant from the nearest part of the Salt Range, and the 

 only other erratics near the Salt Range which, so far as I am aware, 

 could be referred to this supposed glacial period are the large one in the 

 Khewra valley, another above Baghanwala, most probably derived from 

 the boulder beds of group No. 10 in the series; or some crystalline blocks 

 found at the foot of the escarpment between Jalalpur and Baghanwala. 

 The power which transported these blocks and smaller erratics of the 

 Salt Range, if it was not gravitation from the outcrops of the creta- 

 ceous (?) boulder beds,"^ aided by land-slip, may be perhaps referred 

 to some form of ice flotation which seems the only agency adequate for 

 the removal of such large blocks as some of those referred to. 



The general series. — With regard to the general series now described, 

 the sections nearest the Indus are known to be the 

 fullest, and though local developments have been 

 found to differ trans-Indus, the hills in that direction forming the 

 continuation of the range still contain parts of the Salt Range series, 

 and seem to be most largely formed of the mesozoic and tertiary rocks ; 

 portions of the older strata appearing in places. 



Although several of the cis-Indus groups have but a limited lateral 

 extension, a general sequence throughout has been shown to exist, unac- 

 companied by marked or established unconformity up to the pdst-tertiary 

 groups, yet characterised by several instances of transgressive deposi- 



* Whatever may be the cause to which the present situations of these large transported 

 blocks is due, it is equally difficult to account for their original position in the cretaceous 

 conglomerates without the agency of ice. Mr. Theobald's discovery since the above was 

 written, of a veritable ice-scratched boulder on the Salt Range, which he believes to have 

 been derived from these boulder shales of the immediate locality, is very suggestive of 

 ice action as the transporting power. In other parts of the country too, along the left 

 bank of the Indus sotith of Attock, the foreign erratic blocks are too numerous and too 

 large to be accounted for satisfactorily in any other way that I know of. 



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