DETAILED DESCRIPTIONS OF ROCKS. 55 



larger of these, near the village of Phinch, rising to an altitude 

 of 1,001 feet, corsists of red or purple rhyolite without porphyritic 

 crystals, dipping to the south-east at between 25 and 30 degrees. 

 In places the rock has an ashy look and contains imbedded fragments 

 cf rhyolite. 



The large group of hills near the railway station of Khairla, about 

 1 1 miles north-west of Pali, is mainly composed of a coarse granite 

 similar to that above described at Salawas, and like it containing 

 rounded patches up to afoot in diameter of a darker coloured more fine 

 grained rock, some of which may be included fragments. On three sides 

 of the granite schists and slates are exposed, but in no case are they 

 found actually in contact with it. They are usually vertical and much 

 contorted, with a somewhat variable strike, the prevailing direction 

 being N. E. to S. W. The slaty beds are badly exposed in the 

 shallow watercourses on the western side of the large hills close 

 to the railway station, and may be traced across their strike over the 

 low ground to the north-west to within a few hundred yards of a low 

 ridge of Malani rhyolites, the flows in which dip due west at from 

 45 to 5c degrees. These probably rest unconformably on the edges 

 of the slates, but the actual junction is not seen. The rhyolite here 

 is a dark purplish variety, sometimes porphyritic and with well devel- 

 oped flow-structure, the lines of flow coinciding with the dip. The 

 granite hills rise quite abruptly from the plains, and there is little 

 doubt that they are intrusive bosses, although the contact with the 

 surrounding schists and slates is concealed. 



At Samdari on the north bank of the Luni, 23 miles above Jasol, 

 there is an isolated hill of rhyolite, reddish yellow in colour, with 

 flesh coloured porphyritic crystals of felspar and the usual quartz grains. 

 One or two small hills of a similar rhyolite occur lower down the river, 

 and at Mongla, six miles from Samdari, there is one consisting of a 

 dark green porphyritic rhyolite similar to that in the western end of 

 the Nagar range. 



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