22 EOOTE : GEOLOGICAL STRUCTURE OF THE EASTEEN COAST. 



the southern extremity of the hilly ridge they there form. If continuous, 

 these beds would have to be considered as of one and the same set. 



The third bed is seen in a tiny inlier in the alluvium of the Man-eru, 

 5 miles south of Kandukur. It forms but a small 



Massavarain quartzites. , .„ , .. ... ;1 , , „ ., . 



rocky hillock abutting on the bund 01 the great 



Massavaram tank,, but is worthy of special notice, as being perfectly 

 different from the ordinary quartzites of this region. The rock is a very 

 glassy large-grained quartzite of delicate pale aquamarine-green, banded 

 with deep purple. The purple bands occur in discontinuous laminse, 

 looking much like so many stains. If cut and polished it would be a 

 stone of quite extraordinary beauty for decorative purposes. The hill 

 is formed by a boss on the outcrop of a bed which has a steep dip to the 

 east-by-south. Another mass of quartzite of glassy texture and pale 

 aquamarine-green was noted in the jungle near Balla Venkatapur, on 

 the west side of the Pieherlakonda quartzite curve. 



Among the less common forms of schistose gneiss to be mentioned are 

 Talcose and chloritic * ne talcose and chloritic beds, which occur in various 

 scnists - parts of the schistose area, but especially in the 



western schistose band. Nowhere, however, do they form an important 

 feature. The greatest development of the talcose rocks is to be seen 

 near the head waters of the Mushi river, immediately east of the boundary 

 of the Kadapa rocks, and at the villages of Gazulapalle (Gazoolapully), 

 Chinna Managundum, and Soutapalem. They occur in considerable 

 quantity also to the north of the Musi river, between Chendalur hill 

 and the Kadapa boundary. Talcose rocks were also observed to the 

 west of Vinnukonda, near the villages of Bharatapuram and Naddigudda. 

 The rocks are generally talcose schists. A coarse gritty variety of talcose 

 gneiss occurs along the boundary of the Kadapa basin near Chittapuram 

 to the northward of Vinnukonda. 



Chloritic schists are found chiefly in the southern part of the schistose 



area, near the villages of Narapareddypully and Malareddypully, 8 or 



9 miles south-west-by-south of Kanigiri. They here occupy the place 



that should be filled by the extension of the western branch of the 



( ^ ) 



