13a FOOTE : GEOLOGY OF THE BELLARY DISTRICT. 



two trapflows. It was much obscured by talus and long grass, and 

 could only be traced for a short distance. The outcrop was remark- 

 ably weathered. 



The northern slope of the eastern hilly tract sinks down into a very 

 level plain so thickly covered along its southern side with talus 1 and 

 cotton soil that it is impossible to determine the boundary between 

 the Dharwars and the granite gneiss within half a mile. The boundary 

 appears to run nearly due east and west, and in the south-eastern 

 corner of the plain where it cuts the Avinamadagu nullah, a small rise 

 in the ground brings up a patch of schists with a backbone of poor 

 haematite quartzite which forms the southern extremity of a small 

 anticlinal ellipse which dips under the basement trapflow. It is of 

 interest only as a probable equivalent of the Joga hills and Linga- 

 dahalli schists. 



To the south of Sultanpur the basement trapflow forms a rather 

 Basement trapflow rocky hill with a steep scarp on the western side 

 south of Sultanpur. down to the g ran i te gneiss. To the east the trap 



extends in an uninterrupted spread across the Avinamadagu nullah 

 and up into the hills, in which it becomes a portion of the Copper 

 mountain synclinal. 



The hills of the Joga-Sultanpur area have been entirely denuded 

 of trees to supply Bellary town with fire-wood, and at present they 

 only support long grass and scattered bushes despite the richness of 

 the soil formed by decomposition of the highly basic traps. The 

 hills are mostly rounded in shape and large protruding masses of rock 

 are rarely seen. 



C. — The Copper Mountain^ or Sugganwiadevibetta synclinal. 



This long and narrow folding of the Dharwars is connected with 

 the Sandur synclinal by the broad spread of contemporary trap just 

 described, and this trapflow is in its south-eastern extension included 

 in the folded area. 



J Consisting mainly of coarse trap debris and very largely cemented by kankar into 

 a sub-aerial agglomerate. 



( I32 ) 



