GNEISSIC ROCKS. 41 



ordinate bands of granite, and syenite gneiss. Besides these^ he mentions 

 talcosee and chloritic schists, also actinolite schist, which is very rare in 

 the Deccan. Crystalline limestones appear to be entirely wanting, except 

 on the Talewari ghat, and there they only just descend low enough to 

 be reckoned as partly in the Konkan. 



The rocks met with in the gneissic series are divisible into two 



great groups,— the granitoid, highly crystalline 

 Two groups, — T . J i 1 7 • , 



Granitoid and Schistose. ^^^ massive, and the schistose, less crystalline 



and often highly foliated and distinctly bedded, 



but each of the groups includes a considerable number of distinct 



and well-marked rock varieties, many of which deserve special notice. 



The association of these rocks in distinct and separate bands has already 



been mentioned. 



The granitoid group includes granite -gneiss and syenite-gneiss in 



many varieties, some depending on the predomi- 

 The granitoid group. i o x 



nence of one or other of the constituent minerals, 

 others upon the difference of texture, whether coarsely or finely crystalline 

 or porphyritic ; and as usual there are many cases of transition from one 

 into the other, not only between the varieties belonging to one or other 

 of the two great groups, but also of the members of one group passing 

 into rocks included in the other. 



The granitoid group occupies a greatly larger extent of surface 

 within the area to which this report refers than 

 gneiss area.^ "'^ ^"^^"^ ^ ^^^^ ^^^ schistose group. The whole of the eastern 

 part of the gneissic area shewn in the accompany- 

 ing sketch map is, speaking generally, occupied by highly crystalline 

 and massive granite gneiss in all its varieties. 



Only a few unimportant bands of hornblendic or micaceous schist 



are to be seen in the country stretching from the 

 Maski schistose band. 



Raichur group of granitoid hills westward to 



Gallag and Jalihal, and extending south-west to near Sindunur and 



IP ( 41 ) 



