I 7 S FOOTE: GEOLOGY OF THE BELLARY DISTRICT. 



mass of granitoid rock surrounding it could not be seen owing to a 

 great debris-talus and to jungle growth. 



The third example of enstatite met with was found close to the 



Near Harappanahalli. Yallapur tank, 4 miles north-west of Harappa- 



nahalli. The rock is of dark grey colour and exceedingly coarse grain. 



Here again no contact is seen with the country rock which is a rather 



remarkable variety of finely banded " Augen Gneiss." 



CHAPTER VII. 

 High level Lateritoid talus terraces. 



Along the central part of the southern flank of the KumaVaswami 

 plateau occur two distinct terraces, of very considerable interest, 

 which abut against the main slope at about one-third of its height 

 above the adjoining low country. The surfaces of the two terraces 

 are very generally uniform, and have gentle slopes southward down 

 to their sharp-cut and generally rather scarped southern edges. 

 Along their northern edges close in to the base of the flank of the 

 plateau the slopes of the surface are for a short distance much greater 

 owing apparently to the continuing accumulation of talus. 



The surface of these terraces is formed by a thick haematitic talus 

 breccia, increasing in coarseness as the flank of the plateau is 

 approached. The breccia has been greatly lateritised and shows 

 much vermiculate tubulation as well as much pisolitic structure. 

 As far as can be judged by the sections formed in rain gullies near 

 Thickness of the talus the edge of the terraces, the breccrated talus 

 breccia. mass is about 20 feet or rather more in thick- 



ness, and rests along its northern side on the basement beds of the 

 Dharwar system and along its southern side on greatly decomposed 

 felspathic granite. The edge of the scarp is almost everywhere 

 greatly obscured by a local talus of big lateritoid blocks. Where the 

 surface is bare of vegetation the contrast between the deep red brown 

 of the haematitic breccia and the pale decomposing granite is very 

 great and conspicuous^ 



( 178 ) 



