GNEISSIC ROCKS. 45 



The transition from the highly crystalline massive form to dis- 



Transition to schistose ^^^^^^'^ ^^^^^^ ^""^ ^^^'^ schistose rocks, is often to 

 varieties. . \yQ gggjj j^gg^j. ^]^q boundaries of the granitoid 



areas. The granitoid gneiss in those cases shews a broadly banded 



structure^ the bands being parallel to the true foliation of the less altered 



rocks, and being in fact the true layers of original deposition. In many 



cases such banding is met with even in the main granitoid masses far 



away from any point of transition, and the banded parts of the rock 



often present the appeai'ance of being enclosed masses of a foreign rock, 



though in reality they were only parts less completely metamorphosed 



than the main mass. Such transitions may be seen and studied to great 



advantage at various places within the gneissic 

 Examples. 



area ; for example, along the eastern base of the 



ridge forming the Maski hill, and at Kotapur near Kautala (Ci vital), 



the former in the Mudgal, the latter in the Eaichur taluq. 



A remarkable variety of syenite gneiss, noticeable because of its great 



beauty, was seen on the south bank of the Krishna 

 Red syenite gneiss. , . 



just opposite to the Jaldrug(Juldroog). This rock, 



which is very porphyritic in texture, is of bright red color, and has taken 



a very high polish on many of the rocks in the bed of the river. The red 



color is owing to the great predominance of the red felspar it contains. 



The hornblende is greenish black. A very similar rock forms the Pela- 



konda /Tailpenta) hill or *'Bell rock,^' a very conspicuous rooky hill 



south-west of Ling Sugur cantonment. The rock is of a bright red 



color, and largely traversed by films and veinlets of bright yellow green 



pistacite. It rises out of the pale pinkish grey '' blotchy^^ gneiss of 



the neighbourhood, as if an irrupted mass, but there is no positive 



evidence of its being such. 



Another remarkably handsome variety of porphyritic syenite gneiss, 

 in which dark green hornblende and dark salmon-colored or brownish - 

 pink felspar unite to form a stone of very rich color, occurs at Gajen- 

 dragarh underlying the extreme south-eastern end of the Kaladgi series. 



( 45 ) 



