LOWER TRANSITION ROCKS. 137 



the magnesite are very irregular in size, swelling out suddenly in places 

 and here and there assuming the appearance of nodules. 



At the foot of the southern end of this section of the Copper 

 mountain ridge, which is locally known as the Suji Konda, the lowest 

 member of the Dharwar series is the Joga trapflow, which is here very 

 thin, and dies away a little distance further north-north-west when the 

 lowest haematite quartzite, which widely overlaps the trapflow, rests 

 directly on the surface of the granite, which is here of the highly 

 Contact of Dharwars porphyritic Bellary type. The actual contact 

 and granite. j s t De seen h ere an( j there where the talus 



has been washed away. The contact between the two rocks is per- 

 fectly sharp and distinct, and it is manifestly only a case of super- 

 position of the haematite quartzite. There is not the slightest altera- 

 tion in the character of the haematite at the contact, and the two rocks 

 do not adhere. 



Newbold, though in general a sound observer, propounded the idea 

 that the great schist series had been broken through by the granites, 

 and mentions cases of the direct intrusion of the latter into the schists 

 both on a large and small scale. Had he seen this section I don't 

 think he could have misunderstood it. What misled him was his not 

 having recognized the fact that there are younger granites which 

 ntrude into the older granitoids and the overlying Dharwars as well. 

 Nowhere did I find the old granitoids behaving irruptively towards the 

 Dharwars, but everywhere the latter show that they had been deposited 

 quietly on the rugged or smooth surface (as the case might be) of the 

 old crystallines. 



The haematites in the north-western half of the synclinal are, as a 



Suji Konda haema- ru ^ e » po° rer m iron than in the south-eastern half, 



tltes - but here and there an exceedingly rich stretch 



occurs in one of the beds. A good example of such a rich stretch 



occurs on the Suji Konda before named. 



Outcrops of haematite quartzite, the extensions of the eastern of 

 the two great beds forming the crest of the northern end of the ridge, 

 occur in the line of the bund of the great Daroji tank. Near the 



( *37 ) 



