90 F00TE : GEOLOGY OF THG I3ULLARY DISTRICT. 



Uchingi Drug side band. — This branch is the northern extension 

 of the western branch of the great Dambal-Chiknayakanhalli band? 

 which in my paper on the Chief Auriferous Rock Series in South India, 

 (Rec. Geological Survey of India, Vol. XXI, Part I, page 53), I de- 

 scribed as the ." Halekal gudda side band." No place of any importance 

 stands on its surface within British territory, so I name it after the 

 only place of any note that lies near it. It runs close to the eastern 

 base of Uchingi Drug hill, and extends from the Mysore boundary north 

 by west for 8| miles, and is then lost to sight under surface debris. 



The western boundary of this band is an ordinary erosion boundary, 

 the eastern, which is everywhere concealed under surface deposits, is 

 a fault boundary, the Dharwar rocks being let down several hundred 

 feet and abutting against banded granitoids. 



Between the coarse granitoid of the Uchingi Drug hill and the 

 P t east of Uch- undoubted Dharwars is a band of coarse pot- 

 ingi Drug. stone which is of doubtful age. It is identical 



in appearance with other beds of potstone further to the north and 

 north-west, which certainly seem to be part and parcel of the gneissic 

 system (see page 32). Unfortunately its relation to the Dharwar 

 beds to the east of it is quite obscure, and will have to remain 

 so till some section can be found or formed which shall solve the 

 question. The southern part of the steatite ridge looks as if it 

 had no connection with the Dharwars. The rock contains many 

 crystals of greenish white talc. % 



Lying eastward of the potstone are greenish brown schists which 

 Chettanhalli schists are seen to the east of Chettanhalli village 1 , 2 

 and quartzites. mi j es sou th-east of Uchingi village. These schists, 



which are several hundred feet thick, are overlaid by a considerable 

 thickness of pebbly, gritty and waxy quartzites, these latter being 

 generally of a pale sea-green colour. The included pebbles are gene- 

 rally of pale colour, and many of them are a good deal deformed by 

 shearing acting. These pebbly beds form the upper third of Chet- 



1 Chettanhalli village lies really quite half a mile east of the position given to it in 

 sheet 59. 



( 90 ) 



