18 foote: geological structure of the eastern coast. 



.Fifteen miles to the north of Shinampudi (Sanampoody) Tippa lie 

 Ongole group of iron the most southerly members of the Ongole group 

 teds. f magnetic iron beds, consisting of four beds 



forming 1 a strong anticlinal curve round and through the mass of the 

 Konijedu bed. Konijedu (Conjadoo) hills. The other members 



are the magnetite beds which form the main mass of the Ongole hills, 

 and those forming the Parnametta hill, 4 miles north-west-by-west of 

 Ongole. A glance at the map will show that, although separated from 

 each other by considerable distances, the position of these three sets, or 

 sub-groups, of magnetite beds, relatively to each other, is such as 

 inevitably to suggest a direct connection between two of them, if 

 not between all three. The strong petrological resemblance of the 

 beds themselves and of the intermediate gneissic beds, as well as 

 the near correspondence in number of beds, leads me to regard the 

 Parnametta and Ongole beds as merely the extensions of the great 

 Konijedu curve, the Parnametta beds corresponding with the northern, 

 the Ongole with the north-eastern arm of the great anticlinal curve. 

 A very trifling bend in the strike of the two arms of the curve would 

 cause the extension of the beds, now masked by overlying lateritic 

 and alluvial deposits, to coincide with the Parnametta and Ongole 

 beds. It is, however, possible that the Ongole and Parnametta beds 

 may form the arms of another curve (parallel to the Konijedu curve), 

 the apex of which is hidden by the newer formations. I regard the 

 first assumption as the more probable, and the more so as the Par- 

 nametta beds resemble the Konijedu beds more closely than the Ongole 

 beds. 



The Konijedu group consists of four principal beds, of which the 



two upper ones are the richest. They are fairly 

 Konijedu iron beds. . . . 



rich as compared with the most important or the 



great magnetite beds in Salem district. The same may be said of 

 the Ongole and Parnametta beds ; they do not, however, appear to 

 have been worked for iron ores, though largely used as rough build- 

 ing stone. 



( 18 ) 



