ARCH^AN AND PLUTONIC ROCKS. 37 



closely the boundary between the gneissic band and the granitoids to 

 the eastward of it. The whole of this gneissic tract is very flat, with 

 hardly a single prominence to break the monotony of the plain, and 

 it is only along its western side that a few striking hills — the grani- 

 toid bosses just referred to — rise from the flat. 



The eastern and larger half of the area (subdivision) is occupied 

 Granitoids of eastern b y granitoid rocks belonging chiefly to the 

 part# groups "a" and " c" above defined. The rela- 



tions of these two groups and their distribution need much further 

 study before they can be understood and represented graphically. 



The granitoid half of the area, instead of being flat and monotonous, 

 is in most parts dotted over with numerous hills, and in many places 

 extremely rugged and hilly the hills, rising from 500 to 1,000 feet or 

 more above the plains and affording much wildly beautiful scenery. 

 The topographical features of this area have already been described 

 in the introductory chapter (ante p. 6) and need not be repeated here. 



The hill groups met with may conveniently be called the Kudligi 

 Groups of hills met an< ^ Gudikote (Goodicotta) hills, the latter conti- 

 Wlth * nuing south-eastward, across the north extremity 



of Mysore, into the Raya Drug group, which geographically include 

 the fine mass of hills around Molakal Muru (Molakal Mooroo) in 

 Mysore. 



It has already been noted that the gneissic rocks forming the 

 Gneissic tract very western half of the band have been weathered 

 flat * down to a very level surface, and the plain they 



form is thickly covered by cotton soil. Not a single good section 

 was met with and none showing them in juxtaposition with the 

 granitoid rocks. They are seen at intervals in the banks of nullas, 

 but are everywhere immensely weathered and tremendously cut up 

 by innumerable veins of a whitish pegmatite of all possible sizes. 

 The two best sections of them I met with were in the off-flow channel 

 of the great tank at Kotturu (Cottoor) and in the banks of the nulla 

 at Itugi (Hittigay), a tributary from the west of the Chikka Haggari, 

 but in both of these it was impossible to find any part of the rock 



( 37 ) 



