158 FOOTE: GEOLOGY OF THE BELLARY DISTRICT. 



intervals of 4 miles ; the most north-westerly about a mile E. of 



Antapur, the most south-easterly to the N. of Hirrahal, and the 



central one a little south-east of the Mallam Gudda peak. 



Part of the southern boundary of the Joga Sultanpur band uniting 



the Copper Mountain and Sandur hills tracts 

 Kudal quartz-run. , , . . . . 



is formed by an important quartz-run which 



passes close to Kudal (Koodall) and forms a considerable hill. 



Unfortunately no contact with the trap-flows forming part of 



the Dharwar area immediately north of the fault-rock, nor 



with the great Avinmadagu trap dyke, was found ; so the exact 



relations of the intrusive quartz with those rocks could not be 



observed. 



At the western end of the run where the brecciation of 



the quartz is not well marked, and a remarkably close-set series 



of nearly vertical joint planes simulate true bedding planes very 



successfully, the rock might very easily be mistaken for a very highly 



metamorphosed quartzite. 



The largest and most important quartz-run on the boundaries 



of the Sandur area occurs only about 2 miles 

 roSc° S9et HiH faUlt ' eastward of the P oint where the Dharwar rocks 



cross the great rapid in the Tungabhadra. This 

 run which is best, though very ill, seen a couple of hundred feet or 

 so up the N. and N. E. flank of the Jannel Rashi, the Hospet 

 Trig, station hill, forms the north-western end of the north-eastern 

 side of the synclinal fold. This run certainly seems to be in the 

 position of a true fault; for the very strong and conspicuous haematite 

 beds which form the mass of the Hospet hill and are the extension of 

 the great eastern series are suddenly cut off on the northern slope and 

 cannot be traced any further to the northward. The position of 

 this quartz-run with reference to the Dharwars composing the 

 Hospet hill is quite clear, but owing to the great amount of 

 talus on the slope the contact relations of the two rocks cannot be 

 seen sufficiently to allow of their being studied to any advan- 

 tage. 



( 158 ) 



