6 FOOTS : GEOLOGY OF THE BELLARY DISTRICT. 



quartz occurring in the rock is of unusually limpid character, which 

 allows the black mica to show through in many places and produces 

 a very rich grey colour. It is largely quarried. 



A variety of granite gneiss not often met with occurs four miles 

 Banday type of ^ran- to tne northward of Harapanahalli in shape of 

 te gneiss. a ver y finely laminated rock, in which the 



laminae of white felspar and black mica, at very frequent intervals, 

 make a wavy curl round a small nucleus (of quartz?), which produces 

 a speckled appearance of a very pleasing grey colour. It is spe- 

 cially well seen at Banday, close to the new high road, where it forms 

 low "whale back" hills; it is considerably developed there and to 

 the north-westward, with a strike parallel to the axis of the Mallapan 

 Gudda Dharwar band. It would appear to be an unusually small- 

 eyed variety of "Augen gneiss." 



(2.) The Kudligi-Raya Drug Subdivision. — This section of the 

 granitoid area is a very large one, occupying as it does the whole of 

 Kudligi taluq and the greater part of the Huvin-Haddagalli and 

 Raya Drug taluqs, besides a corner of Hospet taluq. In plan it forms 

 a broad band, about 70 miles long on its longer or eastern side, and 

 30 wide, stretching from the right bank of the Tungabhadra to 

 the boundaries of Mysore and the Anantapur district. 



The examination of the greater part of this great tract had unfor- 

 tunately to be but a cursory one. I was instructed to get over it as 

 speedily as possible, only making sure that no outliers of the more 

 metalliferous Dharwars were overlooked. To do this a sufficiently 

 close net-work of traverses was made, to obtain a general idea of 

 the distribution of the principal granitoids and gneisses occupying 

 the subdivision. 



The whole of the western side of the band is occupied by gneissic 

 Gneissic rocks of the rocks, with a few small exceptions in the way 

 western part. f bosses of granitoid rocks, to be named sepa- 



rately further on, and which appear to be inliers of the older grani- 

 toids exposed by denudation and not intrusive masses. In the north- 

 ern part of the area, the course of the Chikka Haggari is pretty 



( 36 ) 



