32 POOTE : GEOLOGICAL STRUCTURE OF THE EASTERN COAST, 



country east of Kanigiri, the Chimakurti mountain, the great spread 

 of hornblendic, mostly trappoid, gneiss around Pothakamur (Pooth- 

 kamoor), a very similar trappoid spread forming the Bogalakonda and 

 adjoining hills, the Kotappakonda and the Ramakur hills. Another 

 area of intensely hornblendic beds is found to the north of Guntur, in 

 the Lam, Tadikonda, and Nirukonda hills. The micaceous variety occurs 

 Areas of predominance principally in the Kanigiri and Podile hills, also in 

 of micaceous rocks. fa e g r0 up of low hills on the border of the Darisi 



and Vinukonda taluqs, and in the Vinukonda hills. In the Kondavidu 

 hills and in those lying between Guntur and Amravati the two varieties 

 occur together in about equal proportions. 



The epidotic variety forms the mass of the Bellamkonda in Satten- 



apalle taluq, and occurs also in the lower hills ex- 

 Epidotic granite gneiss. ; 



tending northward towards the Kistna. Jipiclotic 



gneiss occurs also in the inlier north of Vinukonda, at a place half-way 



between Sarikondapalem and Vaddagunta. 



The most characteristic display of the granite gneiss in its scenic 



features takes place in the Kanigiri and Podile hills, 



Scenery. 



and in the granitoid area around the Bellamkonda, 

 in the extreme north of our area. In these localities are numerous ex- 

 amples of " blocky " structure, whole hills appearing built up of loose 

 masses with slightly rounded angles. Perhaps the finest example of 

 this is furnished by the Kanigiri Drug hill. 



The granitoid characters are rather less pronounced in the Kondavidu 

 hills, the bedding having on the whole been less 



The Kondavidu hills. . .,■•■■, , *, 



obliterated than in the granitoid tracts last men- 

 tioned. They form the most picturesque group of hills throughout the 

 Guntur-Ongole region, especially as seen from the north-west or south- 

 west. They must, however, yield the palm to the Kondapilly hills, im- 

 mediately north of the Kistna, which appear to be formed of an extension 

 of the same series of beds. The Kondavidu hills consist of two principal 

 ridges, which do not correspond with the great lines of bedding, but 

 ( 32 ) 



