SCHISTOSE AREAS. 17 



micaceous quartzite is crammed with prisms, mostly minute, of black . 

 tourmaline. This is well seen where the ridge is crossed by the footpath 

 leading direct from Chundi to Ramalingapuram. A similar bed occurs 

 on the east flank of the hill west of Lingasamudram, close to the 

 staurolite bed already referred to above. Close by another bed contains 

 very large coarse crystals of equally black tourmaline, several large lumps 

 of which were brought to me by a native under the impression it 

 was coal. 



Among the most noteworthy members of the schistose group are 



Magnetic iron and tne ferruginous beds ; these are of two kinds, the 

 haematite schist beds. magnetic iron beds and the haematite schist beds. 



The former, though not so rich as the great magnetite beds in Salem 

 district, &c, are yet deserving of much attention, both stratigraphically 

 and industrially ; but the remarks to be made on their industrial import- 

 ance will be reserved for the chapter treating on the economically im- 

 portant geological features. Of the haematite schists only one example 

 was met with which will be referred to more fully further on. All the 

 more important magnetic iron beds of the gneissic series belong to the 

 eastern schistose band ; but several are found occurring in outliers 

 away from the main band, the intervening space being occupied by the 



Two groups of mag- newer sedimentary formations. They occur in two 

 n ole° and b< the Gundla- P rmci P a l groups which I propose to call the Ongole 

 kamma groups. and the Gundlakamma groups respectively, the 



former occurring near the town of Ongole, and the latter lying entirely in 

 the lower part of the valley of the Gundlakamma river. Only one small 

 bed was met with, which from its position could not be assigned to these 

 groups ; this occurs in a small inlier of gneiss on the left bank of 

 the Man-eru, 3 miles south-west of Singaraza Konda travellers' 

 bungalow on the great north trunk road. This magnetite bed forms 



a low rocky ridge rising out of the alluvium and 

 Shinampudi bed. 



lateritic shingle, and known locally as the Shinam- 

 pudi Tippa. The bed is of considerable thickness, about three-quarters 

 of a mile long, and moderately rich in iron. 



b ( 17 ) 



