SCHISTOSE AREAS. 19 



The number of beds at Ongole is five principal ones, though seven 



might be counted if two which contain thin 

 Oagole iron beds. . . 



gneissic partings be regarded as tour several beds. 



The dip of the beds is from 40° to 55° south-south-easterly. As at Konijedu, 



the southern beds are the richest; they form the low ridge abutting on 



the high road close to the shrine and Math of some Pir of great local 



sanctity. The northern beds, which form the Trigonometrical station hill, 



are much less rich in iron. The Math hill beds are fairly typical magnetic 



iron beds, in which the magnetite occurs in discontinuous granular laminse, 



interstratified between granular quartz laminse, which are generally 



stained of a reddish or brownish colour where weathering has taken 



place to any extent. The un weathered rock is generally of a purplish or 



blackish-grey colour. The non-ferruginous bands separating the different 



magnetite beds both here and at Konijedu consist of a quartzo-felspathic 



granite gneiss, in some places coarsely granitoid in texture, but showing 



in others a texture resembling woody fibre, which might for brevity be 



described as " xyloid/' 



The Parnametta beds are four or five in number, have a westerly 



dip of about 60°, and show signs of having under- 

 Parnametta iron beds. 



gone much greater disturbance than the other 



sets of beds to the east and south. A number of rude cleavage planes 

 render the interpretation of the stratification by no means easy or 

 satisfactory. 



The Gundlakamma group of magnetite beds consists of four sub- 

 Gnndlakamma group groups, separated from each other, except in one 

 of iron beds. case ^ ^y considerable distances, and showing no 



features of special resemblance on which to base any comparison between 

 them. Still their general position, with reference to the adjoining 

 members of the gneissic series and to the general strike of the bedding 

 in that tract of country, indicates that they may very probably belong 

 to one and the same horizon, though now broken into detached portions ; 

 it is quite probable too that they may be representatives of the Ongole 

 group. 



( 19 ) 



