LESGRIPTIVE GEOLOGY: CRYSTALLINE AND METAMORPHIC ZONE. 229 



west near Sobruh, another following the length of the ridge north of 

 Teer village, and a third occupying a large space of country between 

 Doodha mountain and Burkot Between them come other areas 

 indicated on the map as Tanols, whilst to the north of both Infra- 

 Trias and Tanols come the gneissose-granite and crystalline schists. 

 In consequence of this it will be convenient first to describe each 

 of these isolated Infra-Trias areas by itself, by reference to and by 

 means of sections along particular lines. 



The low slate-hills north of Abbottabad, of which Hubeebuh 

 mountain forms a prominent peak, have already 



Section across the 



Sobruh band of Infra- been mentioned in the descriptive part of the 



Trias rocks. _. _ . . , 



Slate zone. It was remarked there that they 

 shew no trace of any extra metamorphism until they approach the 

 north-western boundary of the Slate zone, and that then the chief 

 sign of such extra metamorphism was to be found in the quartz 

 veins, from 6 to 12 inches across, which ramify through them. The 

 absence of any limestone bands in the slates and of any prominent 

 quarizose beds in this locality also make it impossible to unravel the 

 complicated folds into which such thin-bedded rocks are thrown, for 

 the simple reason that surface dips among shattered rocks of this 

 kind are completely untrustworthy owing to surface deflection. 



At Sobruh Gulee, about one mile north-west of the "T" of 

 Thunnuh, the low slate country is connected with the higher rocky 

 crags of the Infra-Trias band of rocks by a narrow little neck, or 

 divide, forming a small pass between the head of the Miankhaki 

 stream which flows south-west and a little stream which runs north- 

 east by Puswal. Here the Slate series, slightly metamorphosed as 

 described above, gives way to what at first sight appears to be a very 

 normal section in the Infra-Trias. The slates for the moment are 

 dipping south-east at fairly high angles, and above them the Infra- 

 Trias crags are dipping north-west— a condition very much resembl- 

 ing that north of the Tanakki glen (see p. ioo). A section across the 

 band of rocks at this point is given overleaf, fig. 40. We may note 



( 229 ) 



