I76 M1DDLEMISS : GEOLOGY OF HAZARA AND BLACK MOUNTAIN. 



The Slate zone as a whole. 

 In taking leave of the descriptive part of the Slate zone, the fol- 

 lowing more noteworthy results of a general character may be here 

 summarised : — 



1. Despite the great expanse of country occupied by the Slate 

 series in this zone, and despite the great vertical range through 

 which they are exposed, there is only one locality away from the 

 border of the crystalline and metamorphic zone, namely, near Puttun, 

 where they possess the slightest trace of a mineralisation along their 

 folia, tending to link them with the crystalline schists. 



2. As regards the Infra-Trias, we have found that it is confined 

 to a well-marked sub-zone on the north-western side of the main 

 zone, and that although continuous the whole length of the zone, it 

 dies out with extraordinary rapidity in the opposite direction. 



3. Nothing is more noticeable throughout this zone than the per- 

 sistent mutual inter-relationship existing between the various mem- 

 bers of the stratigraphical sequence from Trias to Nummulitic, so that 

 each and all are almost invariably found together in the same cliff 

 section or on the same hill-side. 



4. As regards the geotectonic features of the area we must 

 note — 



(a) The uniform steady strike of the area, north-east and 



south-west, or thereabouts. 



(b) The generally elliptical or lenticular shape of the outliers 



of the formations younger than the slates. 



(c) That these outliers taper away very gradually as a rule in 



a south-westerly direction, whilst to the north-east they 

 are rather more abrupt and blunted. 



(d) That the flexuring of the area is of a rather extreme type, 



and somewhat more marked and characterised by iso- 

 clinal folds along the Infra-Triassic sub-zone than else- 

 where, and that the sigmaflexure type of fold with 

 accompanying overthrust is prevalent. 



( «76 ) 



