ARCHAEAN AND PLUTONIC ROCKS. 39 



To return for a little while to the tract east of Kankappa gudda, 

 near Nandi Bevur. Half-way between Kan- 

 kappa gudda (hill) and Kalhalli (Cullhully) is a 

 low reddish ridge, which at a little distance looks very much like a 

 run of brecciated quartz rock, but on close inspection proves to be a 

 bed of granular quartz rock, identical in appearance and texture with 

 the quartz rocks which figure so largely in Madura district. 1 

 Associated with it, intercalated with it in fact, are quite thin beds of 

 greenish gneiss, in which the mica spangles are intensely green, but 

 the quartz only moderately coloured, apparently from the presence 

 of copper. 



Further south, along the western side of the subdivision, outcrops 

 of rocks are exceedingly few and far between. Those lying near 

 the Dharwar band, in the bay it there forms, are granites, but further 

 east the gneissic band is met, but has greatly narrowed from its 

 more northerly width. 



At Ujinni (Oojinny) and to the west-south-west and south of it are 



a few outcrops of typical hornblendic gneiss. 



]mi At Ujinni, immediately south of the village, the 



gneiss is seen in a well section to dip due south at an angle of from 



40° to 50 . 



The hornblendic gneiss extends across the boundary into Mysore, 

 and there is an interesting section of it to the east of Sokke (Sooka) 

 for 200 to 300 yards along the bed of the small stream draining the 

 tank there. The gneiss is most extraordinarily cut up by veins of 

 red pegmatite, large and small and often anastomosing. 



Much hornblendic schist is to be seen in the Kaikol gudda, a 

 considerable ridge rising on the boundary line 

 to the south of Nimbaipur. The ridge is indeed 

 mainly composed of the hornblendic schist, in which occur veinlets 

 of quartz containing iron-lime garnets. Garnets are very rare in the 

 Bellary rocks, the only other place where I met with them being near 

 the green gneiss outcrop in the south spur of the Mincheri hills. 



1 See Memoir on the Geology of Madura and Tinnevelly, Vol. XX, part 1. 



( 39 ) 



