DESCRIPTIVE GEOLOGY : SLATE ZONE 



*°5 



generally in contact with the fault on that side. It would not be 

 easy to mistake this limestone for anything else. It possesses all 

 the characteristics of the typical Trias, that is to say, it is of dark 

 somewhat purplish-grey colour, sometimes finely oolitic and sandy. 

 It shews the blotches of ochre colour in many places, and never 

 throughout its whole thickness has the slightest resemblance to the 

 rocks on the north-west face of Sirban, which I have sought to 

 establish as belonging to the Infra-Trias series. 



In the low part of the ridge near Shakur Bandee the Trias dips 

 down against the fault at a high angle. Further to the south-west 

 the little spur, running north-west in a line with Abbottabad in the 

 view of Sirban from the north, shews a much more gentle roll up 

 against the fault, which can be plainly seen cutting off the Infra- 

 Trias at the lower end of the hill-spur. In the vicinity of two-tree 



Two-tree hill. 



Fig. 6. 

 f-» Purple sandstone. 

 6=* Limestone and quartzite. 

 « = Brecciated felsite. 

 d<= Trias limestone. 

 * = Spiti Shales. 

 /= Nummulitic limestone. 



],. 



fra-Trias. 



( *° 5 ) 



