20 FOOTE: GEOLOGICAL STRUCTURE OF THE EASTERN COAST. 



Of the four sub-groups, the southernmost, which lies close to the 



village of Burapalle, is the most important by far. 



Two thick beds, separated by a rather granitoid 



gneiss, here form a great part of a considerable hill. They appear to be 



connected with the magnetite beds in the Tammaveram hill, 2 miles 



to the north-north-west; but thick soil and talus accumulations cover 



the outcrops of the beds for about a mile intermediately. Three beds 



are here seen. They are violently contorted, and appear to be cut off by 



a fault to the east ; to the west and north they disappear under the 



alluvial deposits of the river valley. 



About a mile and a half to the north-north-west is another magnetic 



iron bed which forms a small but very rocky hill 

 Manikesvaram beds. . 



just west of the village of Manikesvaram (Mau- 



nikeswarum) . This bed, which forms a very acute bend at the north 

 end of the hill, is exposed for little more than a mile in length, its ends 

 disappearing under the soil. It is underlaid by massive banded horn- 

 blendic gneiss, and apparently overlaid by pink granitoid gneiss, but 

 the contact with the latter is not seen, there being a considerable space 

 between them in which no rock is exposed. This forms the second sub- 

 group of the Gundlakamma group. 



The third sub-group consists of five' beds, which form the main 

 ridges of two hills a couple of miles north of 



Singirikonda beds. 



Addanki. Three of these, which are moderately 



rich in parts only, form the Singirikonda, a hill rising about 400 feet on 



the east side of the great north trunk road. The beds dip east at a high 



angle. In the lower hill west of the road are apparently two beds, but 



their lie is very obscure, and they may possibly represent but one bed 



crumpled into an acute synclinal trough. 



About 4 miles north-west-by-north of the Singirikonda group lies 



another small group of four rather unimportant 



Vemparala beds. 



beds ; their relations to each other are not clear, the 

 two northern beds running at right angles to the strike of the two 

 southern ones. If, as the map suggests, they are parts of a great curve, 

 ( 20 ) 



