?3 6 FOOTE: GEOLOGV OF THE BELLARY DISTRICT. 



of the haematite series of the great synclinal. The great and thick 

 spread of cotton soil which covers the face of the plain renders the 

 settlement of this question difficult. 1 



To the northward of the Budikanama ghat the synclinal has again 

 become recognisable, a couple of haematite quartzites reappearing with 

 the same slight inversion to the west in the position which theoretically 

 they ought to occupy as continuations of the haematite quartzites 

 which, as shown above, died out in the hills south of Kudatanni. In 

 little more than a mile and a half, however, the haematite quartzites 

 die down again not to reappear, and the synclinal character of the band 

 in its northerly extension ceases to be obvious ; indeed, the north- 

 eastern wall of the synclinal is entirely lost under superficial deposits. 



The western wall of the synclinal continues quite distinct for 

 several miles till the ridge sinks down into the valley of the Narihalla, 

 which is here dammed up to form the noble Daroji tank. 



The western haematites, which at the Budikanama are four in 

 number, diverge at the northern end of the first break in the ridge, the 

 two easterly ones running down the northern slope and disappearing 

 from sight under surface deposits about a mile to the north. The two 

 westerly ones, on the contrary, rise again into a good sized ridge which 

 continues to the south end of the Daroji tank. These haematite 

 quartzites are locally a good deal contorted and their dip doubtful. 



Very small veins of white magnesite appear commonly in the 

 Magnesite veins on south-eastern half of the ridge, and are very con- 

 Suji Konda. spicuous where traversing the (locally) black bed 



of haematite. Their occurrence here is remarkable, for there is nothing 

 to account for their presence,— no signs of thermal water action, as 

 is the case with those in the so-called Chalk hills near Salem and else- 

 where in that district and Trichinopoly district. 2 The veinlets of 



1 The nullah which rises close to the southern end of this trap formation does not flow 

 due north, as shown in sheet 58, but trends north-north-west after crossing the Bellary- 

 Dharwar road and flows into the Timapur stream. This fact is somewhat important in 

 connection with the distribution of Dharwar rocks debris over the granitoid plain north 

 of Kudatanni. 



2 See Memoirs of the Geological Survey of India, Vol. IV, p. 90, (on the Geology 

 of Trichinopoly, Salem, and South Arcot. By William King, and R. Bruce Foote). 



( «36 ) 



