60 MIDDLKMISS: GEOLOGY OF HAZARA AND BLACK MOUNTAIN. 



The development of the felspar and garnets in the mica-schist of 

 this locality is evidently connected with the proximity of several 

 veins of gneissose-granite which run among the schist generally 

 parallel to the foliation. 



No. ¥ | ¥ is a highly foliated mica-schist from the locality marginally 

 -.. ,. . . f T , noted. It is more coarsely crystalline than the 



Right bank of Indus " J ■> 



river, W. of Ghazikot. preceding examples, and the foliation planes are 

 sharply defined and straight. It is composed of quartz in abundance, 

 white mica and a little brown mica. Glass and fluid inclusions are 

 present in the quartz. 



No *&* is selected as an example of the more arenaceous type of 



* 8 9 6 



well-crystallised schist. The rock has been com- 

 i mile N. of Kotkai. ... _ 



pletely re-crystallised. There is no trace ot 



anv orio-'mal sedimentary condition left either in the form of bedding 

 or banding or of manifestly fragmentary material. In minute quan- 

 tity dispersed through the rock occur brown mica and white mica in 

 minute patches and shreds, and garnets as in the last specimens. The 

 spaces between the individual quartz grains are filled up by 

 secondary silica or by shreds of mica, brown and white. 



Examples of schists in which the garnets are more numerously 

 developed, sufficiently for the rock to be called 



Garnitiferous schists. ... , . •, . , 



a garnitiferous schist, are known in many places, 

 e.g., ridge north of Diliari overlooking Dedal, above Kunhar on the 

 Indus river, and north-east of Abu (all in the Black Mountain). Some- 

 times the garnets occur gathered together into nests about f inch 

 across and sometimes the rock is almost full of a small variety about 



the size of a pea. 



Of hornblende-schists there is a complete absence in the parts 



of the Black Mountain and Hazara to which I 

 Hornblende schist. ^^ ^ ^^ ^^ ^ abundance Qf 



foliated traps which in some respects mimic hornblende-schists, but 

 there are none of those well-crystallised hornblende-schists of which 

 the origin is at least doubtful. Nevertheless, from the presence of 

 boulders of them in the river-bed of the Indus river near Lalo Gulee 

 ( 60 ) 



