DESCRIPTIVE GEOLOGY : CRYSTALLINE AND METAMORPHIC ZONE. 245 



form of rough and tumbled blocks which at first sight may very well 

 look like erratics, especially when the whole occurrence is partly 

 masked by recent gravels. 



At page 46 I have hinted that a similar explanation may suffice to 

 account for the erratics found south-west of the Gundgurh range, in 

 the portion of the country between Hassan Abdal and Attock. It 

 may be stretching an application of the same explanation too far to 

 include the Jhand erratics also among the same list, but it is a point 

 worth bearing in mind by anyone visiting the locality again. 



I do not propose to describe in great detail the rest of the Gundgurh 



Other sections in the range. Wynne has given three sections across it 

 Gundgurh range. j n his paper ( Rec< G S> of j Vol X II, p. 1 14), and 



to these I refer the reader. The south-eastern side of the range ; which 

 becomes a steep scarp in its central part, exhibits a foundation of the 

 slate series, the slates becoming slightly schistose as we reach the 

 watershed near Rous and Bndda. Among the slates there are lime- 

 stones of the same type as the two kinds found near Lunguryal, 

 which, in proportion as the surrounding slates are less or more meta- 

 morphosed, are themselves less or more marble-like. 



Some of the slates and associated limestone bands become im- 

 pregnated with graphitic matter : one marked band of graphitic 

 shale or schist lies on the N.W. side of the limestone bands S. E. 

 of Rous. This material is said by Wynne to be known to the natives 

 as " surma lurri," but according to information from the jaguedar 

 of Rous this name is the name of a place, and has no connection 

 with the black graphitic layers, nor is the stuff itself used as a substi- 

 tute for surma (antimony) for the eyes. 



The slates are fine-grained and shew prominent banding in the 

 lower parts of the range to the south-east. The ridge near Rous is 

 composed of more arenaceous beds. 



If we cross the ridge here and journey down the north-west 

 slopes towards the Indus valley, we simply pass over rocks the meta-» 

 morphism of which becomes slightly more pronounced as we 

 advance. 



Of the numerous limestone bands that appear at the south-west 



( 245 ) 



